drm/aspeed: Run DRM default client setup

drm/aspeed: 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 aspeed driver specifies a preferred color mode of 32. As this
is the default if no format has been given, leave it out entirely.

v5:
- select DRM_CLIENT_SELECTION
v3:
- add DRM_FBDEV_DMA_DRIVER_OPS macro

Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Cc: Joel Stanley <joel@jms.id.au>
Cc: Andrew Jeffery <andrew@codeconstruct.com.au>
Acked-by: Javier Martinez Canillas <javierm@redhat.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20240924071734.98201-11-tzimmermann@suse.de