drm/kmb: Run DRM default client setup

drm/kmb: Run DRM default client setup

Call drm_client_setup() to run the kernel's default client setup
for DRM. Set fbdev_probe in struct drm_driver, so that the client
setup can start the common fbdev client.

v5:
- select DRM_CLIENT_SELECTION

Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Cc: Anitha Chrisanthus <anitha.chrisanthus@intel.com>
Cc: Edmund Dea <edmund.j.dea@intel.com>
Acked-by: Javier Martinez Canillas <javierm@redhat.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20240924071734.98201-24-tzimmermann@suse.de