MAINTAINERS: update vmwgfx info

Roland will be focusing on lavapipe over the next few months and
won't have time for vmwgfx.
vmwgfx is now maintained within drm-misc.
Signed-off-by: Zack Rusin <zackr@vmware.com>
Reviewed-by: Roland Scheidegger <sroland@vmware.com>
Acked-by: Alex Deucher <alexander.deucher@amd.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20210615182336.995192-1-zackr@vmware.com

MAINTAINERS

@@ -5962,11 +5962,10 @@ F:	drivers/gpu/drm/vboxvideo/
 
 DRM DRIVER FOR VMWARE VIRTUAL GPU
 M:	"VMware Graphics" <linux-graphics-maintainer@vmware.com>
-M:	Roland Scheidegger <sroland@vmware.com>
 M:	Zack Rusin <zackr@vmware.com>
 L:	dri-devel@lists.freedesktop.org
 S:	Supported
-T:	git git://people.freedesktop.org/~sroland/linux
+T:	git git://anongit.freedesktop.org/drm/drm-misc
 F:	drivers/gpu/drm/vmwgfx/
 F:	include/uapi/drm/vmwgfx_drm.h