MAINTAINERS: Add Boris Brezillon as Panfrost driver maintainer

Add Boris Brezillon as Panfrost driver maintainer. Boris is a new lead
developer of the Panfrost Mesa driver and main developer behind the
upcoming Panthor kernel driver that will serve next-gen Mali GPUs.

Remove Tomeu and Alyssa, who left Collabora and stepped down from working
on Panfrost.
Acked-by: Boris Brezillon <boris.brezillon@collabora.com>
Acked-by: Tomeu Vizoso <tomeu.vizoso@tomeuvizoso.net>
Acked-by: Alyssa Rosenzweig <alyssa@rosenzweig.io>
Signed-off-by: Dmitry Osipenko <dmitry.osipenko@collabora.com>
Acked-by: Steven Price <steven.price@arm.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20230822052555.538110-1-dmitry.osipenko@collabora.com

MAINTAINERS

@@ -1614,10 +1614,9 @@ F:	drivers/gpu/drm/arm/display/include/
 F:	drivers/gpu/drm/arm/display/komeda/
 
 ARM MALI PANFROST DRM DRIVER
+M:	Boris Brezillon <boris.brezillon@collabora.com>
 M:	Rob Herring <robh@kernel.org>
-M:	Tomeu Vizoso <tomeu.vizoso@collabora.com>
 R:	Steven Price <steven.price@arm.com>
-R:	Alyssa Rosenzweig <alyssa.rosenzweig@collabora.com>
 L:	dri-devel@lists.freedesktop.org
 S:	Supported
 T:	git git://anongit.freedesktop.org/drm/drm-misc