MAINTAINERS: Panfrost: Add Steven Price and Adrian Larumbe

Recast Steven Price as Panfrost driver maintainer.
Also add Adrian Larumbe in the same role.

Reviewed-by: Steven Price <[e-mail]>
Reviewed-by: Boris Brezillon <[e-mail]>
Reviewed-by: AngeloGioacchino Del Regno <[e-mail]>
Signed-off-by: Adrián Larumbe <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Steven Price <[e-mail]>

MAINTAINERS

···
 ARM MALI PANFROST DRM DRIVER
 M:	Boris Brezillon <[e-mail]>
 M:	Rob Herring <[e-mail]>
-R:	Steven Price <[e-mail]>
+M:	Steven Price <[e-mail]>
+M:	Adrián Larumbe <[e-mail]>
 L:	[e-mail]
 S:	Supported
 T:	git https://gitlab.freedesktop.org/drm/misc/kernel.git