drm/mgag200: Run DRM default client setup

Call drm_client_setup_with_fourcc() 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
v2:
- use drm_client_setup_with_fourcc()

Signed-off-by: Thomas Zimmermann <[e-mail]>
Cc: Dave Airlie <[e-mail]>
Cc: Thomas Zimmermann <[e-mail]>
Cc: Jocelyn Falempe <[e-mail]>
Reviewed-by: Jocelyn Falempe <[e-mail]>
Link: https://patchwork.freedesktop.org/patch/msgid/[e-mail]

drivers/gpu/drm/mgag200/Kconfig

···
 config DRM_MGAG200
 	tristate "Matrox G200"
 	depends on DRM && PCI && MMU
+	select DRM_CLIENT_SELECTION
 	select DRM_GEM_SHMEM_HELPER
 	select DRM_KMS_HELPER
 	select I2C

drivers/gpu/drm/mgag200/mgag200_drv.c

···
 
 #include <drm/drm_aperture.h>
 #include <drm/drm_atomic_helper.h>
+#include <drm/drm_client_setup.h>
 #include <drm/drm_drv.h>
 #include <drm/drm_fbdev_shmem.h>
 #include <drm/drm_file.h>
+#include <drm/drm_fourcc.h>
 #include <drm/drm_ioctl.h>
 #include <drm/drm_managed.h>
 #include <drm/drm_module.h>
···
 	.minor = DRIVER_MINOR,
 	.patchlevel = DRIVER_PATCHLEVEL,
 	DRM_GEM_SHMEM_DRIVER_OPS,
+	DRM_FBDEV_SHMEM_DRIVER_OPS,
 };
 
 /*
···
 	 * FIXME: A 24-bit color depth does not work with 24 bpp on
 	 * G200ER. Force 32 bpp.
 	 */
-	drm_fbdev_shmem_setup(dev, 32);
+	drm_client_setup_with_fourcc(dev, DRM_FORMAT_XRGB8888);
 
 	return 0;
 }