MAINTAINERS: Update entries for Renesas DRM drivers

The rcar-du has never been maintained in drm-misc. So exclude only
this driver from drm-misc. Also, add the tree entry for sh_mobile.

Signed-off-by: Biju Das <biju.das.jz@bp.renesas.com>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Acked-by: Geert Uytterhoeven <geert+renesas@glider.be> # shmob_drm
Link: https://lore.kernel.org/r/20240218164840.57662-5-biju.das.jz@bp.renesas.com
Signed-off-by: Maxime Ripard <mripard@kernel.org>

Author: bijudas

MAINTAINERS

@@ -7025,7 +7025,7 @@ X:	drivers/gpu/drm/mediatek/
 X:	drivers/gpu/drm/msm/
 X:	drivers/gpu/drm/nouveau/
 X:	drivers/gpu/drm/radeon/
-X:	drivers/gpu/drm/renesas/
+X:	drivers/gpu/drm/renesas/rcar-du/
 X:	drivers/gpu/drm/tegra/
 
 DRM DRIVERS FOR ALLWINNER A10
@@ -7199,6 +7199,7 @@ M:	Geert Uytterhoeven <geert+renesas@glider.be>
 L:	dri-devel@lists.freedesktop.org
 L:	linux-renesas-soc@vger.kernel.org
 S:	Supported
+T:	git git://anongit.freedesktop.org/drm/drm-misc
 F:	Documentation/devicetree/bindings/display/renesas,shmobile-lcdc.yaml
 F:	drivers/gpu/drm/renesas/shmobile/
 F:	include/linux/platform_data/shmob_drm.h