drm/amd/display: remove output_tf_change flag

Remove this flag as the driver stopped managing it individually since
commit a4056c2 ("drm/amd/display: use HW hdr mult for brightness
boost"). After some back and forth it was reintroduced as a condition to
`set_output_transfer_func()` in [1]. Without direct management, this
flag only changes value when all surface update flags are set true on
UPDATE_TYPE_FULL with no output TF status meaning.

Fixes: bb622e0 ("drm/amd/display: program output tf when required") [1]
Signed-off-by: Melissa Wen <mwen@igalia.com>
Reviewed-by: Alex Hung <alex.hung@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
(cherry picked from commit 752e6f2)

Author: melissawen

drivers/gpu/drm/amd/display/dc/dc.h

@@ -1348,7 +1348,6 @@ union surface_update_flags {
 		uint32_t in_transfer_func_change:1;
 		uint32_t input_csc_change:1;
 		uint32_t coeff_reduction_change:1;
-		uint32_t output_tf_change:1;
 		uint32_t pixel_format_change:1;
 		uint32_t plane_size_change:1;
 		uint32_t gamut_remap_change:1;

drivers/gpu/drm/amd/display/dc/hwss/dcn20/dcn20_hwseq.c

@@ -1982,10 +1982,8 @@ static void dcn20_program_pipe(
 	 * updating on slave planes
 	 */
 	if (pipe_ctx->update_flags.bits.enable ||
-		pipe_ctx->update_flags.bits.plane_changed ||
-		pipe_ctx->stream->update_flags.bits.out_tf ||
-		(pipe_ctx->plane_state &&
-			pipe_ctx->plane_state->update_flags.bits.output_tf_change))
+	    pipe_ctx->update_flags.bits.plane_changed ||
+	    pipe_ctx->stream->update_flags.bits.out_tf)
 		hws->funcs.set_output_transfer_func(dc, pipe_ctx, pipe_ctx->stream);
 
 	/* If the pipe has been enabled or has a different opp, we

drivers/gpu/drm/amd/display/dc/hwss/dcn401/dcn401_hwseq.c

@@ -2019,10 +2019,8 @@ void dcn401_program_pipe(
 	 * updating on slave planes
 	 */
 	if (pipe_ctx->update_flags.bits.enable ||
-		pipe_ctx->update_flags.bits.plane_changed ||
-		pipe_ctx->stream->update_flags.bits.out_tf ||
-		(pipe_ctx->plane_state &&
-			pipe_ctx->plane_state->update_flags.bits.output_tf_change))
+	    pipe_ctx->update_flags.bits.plane_changed ||
+	    pipe_ctx->stream->update_flags.bits.out_tf)
 		hws->funcs.set_output_transfer_func(dc, pipe_ctx, pipe_ctx->stream);
 
 	/* If the pipe has been enabled or has a different opp, we