MAINTAINERS: Document Imagination PowerVR driver patches go via drm-misc

This is the tree used by nearly all other DRM drivers, so use it for the
PowerVR driver as well.

Signed-off-by: Frank Binns <frank.binns@imgtec.com>
Signed-off-by: Maxime Ripard <mripard@kernel.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20231204132847.1307340-1-frank.binns@imgtec.com

MAINTAINERS

@@ -10397,6 +10397,7 @@ M:	Frank Binns <frank.binns@imgtec.com>
 M:	Donald Robson <donald.robson@imgtec.com>
 M:	Matt Coster <matt.coster@imgtec.com>
 S:	Supported
+T:	git git://anongit.freedesktop.org/drm/drm-misc
 F:	Documentation/devicetree/bindings/gpu/img,powervr.yaml
 F:	Documentation/gpu/imagination/
 F:	drivers/gpu/drm/imagination/