drm/panel: samsung-s6d7aa0: use pointer for drm_mode in panel desc struct

Fixes compilation issues with older GCC versions and Clang after
changes introduced in commit 6810bb3 ("drm/panel: Add Samsung
S6D7AA0 panel controller driver"). Tested with GCC 13.1.1, GCC 6.4.0
and Clang 16.0.3.

Fixes the following errors with Clang:

  drivers/gpu/drm/panel/panel-samsung-s6d7aa0.c:312:14: error: initializer element is not a compile-time constant
          .drm_mode = s6d7aa0_lsl080al02_mode,
                      ^~~~~~~~~~~~~~~~~~~~~~~
  drivers/gpu/drm/panel/panel-samsung-s6d7aa0.c:415:14: error: initializer element is not a compile-time constant
          .drm_mode = s6d7aa0_lsl080al03_mode,
                      ^~~~~~~~~~~~~~~~~~~~~~~
  drivers/gpu/drm/panel/panel-samsung-s6d7aa0.c:443:14: error: initializer element is not a compile-time constant
          .drm_mode = s6d7aa0_ltl101at01_mode,
                      ^~~~~~~~~~~~~~~~~~~~~~~
  3 errors generated.

Fixes the following errors with GCC:

  drivers/gpu/drm/panel/panel-samsung-s6d7aa0.c:312:14: error: initializer element is not constant
    .drm_mode = s6d7aa0_lsl080al02_mode,
                ^~~~~~~~~~~~~~~~~~~~~~~
  drivers/gpu/drm/panel/panel-samsung-s6d7aa0.c:312:14: note: (near initialization for 's6d7aa0_lsl080al02_desc.drm_mode')
  drivers/gpu/drm/panel/panel-samsung-s6d7aa0.c:415:14: error: initializer element is not constant
    .drm_mode = s6d7aa0_lsl080al03_mode,
                ^~~~~~~~~~~~~~~~~~~~~~~
  drivers/gpu/drm/panel/panel-samsung-s6d7aa0.c:415:14: note: (near initialization for 's6d7aa0_lsl080al03_desc.drm_mode')
  drivers/gpu/drm/panel/panel-samsung-s6d7aa0.c:443:14: error: initializer element is not constant
    .drm_mode = s6d7aa0_ltl101at01_mode,
                ^~~~~~~~~~~~~~~~~~~~~~~
  drivers/gpu/drm/panel/panel-samsung-s6d7aa0.c:443:14: note: (near initialization for 's6d7aa0_ltl101at01_desc.drm_mode')

Reported-by: Nathan Chancellor <nathan@kernel.org>
Link: https://lore.kernel.org/lkml/20230523180212.GA1401867@dev-arch.thelio-3990X
Reported-by: kernelci.org bot <bot@kernelci.org>
Link: https://lore.kernel.org/llvm/646c6def.a70a0220.58c1a.903d@mx.google.com
Fixes: 6810bb3 ("drm/panel: Add Samsung S6D7AA0 panel controller driver")
Signed-off-by: Artur Weber <aweber.kernel@gmail.com>
Acked-by: Neil Armstrong <neil.armstrong@linaro.org>
Signed-off-by: Neil Armstrong <neil.armstrong@linaro.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20230524084324.11840-1-aweber.kernel@gmail.com

Author: refractionware

drivers/gpu/drm/panel/panel-samsung-s6d7aa0.c

@@ -37,7 +37,7 @@ struct s6d7aa0_panel_desc {
 	unsigned int panel_type;
 	int (*init_func)(struct s6d7aa0 *ctx);
 	int (*off_func)(struct s6d7aa0 *ctx);
-	const struct drm_display_mode drm_mode;
+	const struct drm_display_mode *drm_mode;
 	unsigned long mode_flags;
 	u32 bus_flags;
 	bool has_backlight;
@@ -309,7 +309,7 @@ static const struct s6d7aa0_panel_desc s6d7aa0_lsl080al02_desc = {
 	.panel_type = S6D7AA0_PANEL_LSL080AL02,
 	.init_func = s6d7aa0_lsl080al02_init,
 	.off_func = s6d7aa0_lsl080al02_off,
-	.drm_mode = s6d7aa0_lsl080al02_mode,
+	.drm_mode = &s6d7aa0_lsl080al02_mode,
 	.mode_flags = MIPI_DSI_MODE_VSYNC_FLUSH | MIPI_DSI_MODE_VIDEO_NO_HFP,
 	.bus_flags = DRM_BUS_FLAG_DE_HIGH,
 
@@ -412,7 +412,7 @@ static const struct s6d7aa0_panel_desc s6d7aa0_lsl080al03_desc = {
 	.panel_type = S6D7AA0_PANEL_LSL080AL03,
 	.init_func = s6d7aa0_lsl080al03_init,
 	.off_func = s6d7aa0_lsl080al03_off,
-	.drm_mode = s6d7aa0_lsl080al03_mode,
+	.drm_mode = &s6d7aa0_lsl080al03_mode,
 	.mode_flags = MIPI_DSI_MODE_NO_EOT_PACKET,
 	.bus_flags = 0,
 
@@ -440,7 +440,7 @@ static const struct s6d7aa0_panel_desc s6d7aa0_ltl101at01_desc = {
 	.panel_type = S6D7AA0_PANEL_LTL101AT01,
 	.init_func = s6d7aa0_lsl080al03_init, /* Similar init to LSL080AL03 */
 	.off_func = s6d7aa0_lsl080al03_off,
-	.drm_mode = s6d7aa0_ltl101at01_mode,
+	.drm_mode = &s6d7aa0_ltl101at01_mode,
 	.mode_flags = MIPI_DSI_MODE_NO_EOT_PACKET,
 	.bus_flags = 0,
 
@@ -458,7 +458,7 @@ static int s6d7aa0_get_modes(struct drm_panel *panel,
 	if (!ctx)
 		return -EINVAL;
 
-	mode = drm_mode_duplicate(connector->dev, &ctx->desc->drm_mode);
+	mode = drm_mode_duplicate(connector->dev, ctx->desc->drm_mode);
 	if (!mode)
 		return -ENOMEM;