drm/logicvc: Run DRM default client setup

drm/logicvc: 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.

The logicvc driver specifies a preferred color mode from the value
in struct drm_mode_config.preferred_depth. The fbdev client also
looks at this value for the default pixel format. Thus remove the
format selection from logicvc.

v5:
- select DRM_CLIENT_SELECTION

Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Cc: Paul Kocialkowski <paul.kocialkowski@bootlin.com>
Acked-by: Javier Martinez Canillas <javierm@redhat.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20240924071734.98201-25-tzimmermann@suse.de