drm/sun4i: 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 sun4i driver specifies as 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

Signed-off-by: Thomas Zimmermann <[e-mail]>
Cc: Maxime Ripard <[e-mail]>
Cc: Chen-Yu Tsai <[e-mail]>
Cc: Jernej Skrabec <[e-mail]>
Cc: Samuel Holland <[e-mail]>
Acked-by: Javier Martinez Canillas <[e-mail]>
Link: https://patchwork.freedesktop.org/patch/msgid/[e-mail]

drivers/gpu/drm/sun4i/Kconfig

···
 	tristate "DRM Support for Allwinner A10 Display Engine"
 	depends on DRM && COMMON_CLK
 	depends on ARCH_SUNXI || COMPILE_TEST
+	select DRM_CLIENT_SELECTION
 	select DRM_GEM_DMA_HELPER
 	select DRM_KMS_HELPER
 	select DRM_PANEL

drivers/gpu/drm/sun4i/sun4i_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_dma.h>
 #include <drm/drm_gem_dma_helper.h>
···
 
 	/* GEM Operations */
 	DRM_GEM_DMA_DRIVER_OPS_WITH_DUMB_CREATE(drm_sun4i_gem_dumb_create),
+	DRM_FBDEV_DMA_DRIVER_OPS,
 };
 
 static int sun4i_drv_bind(struct device *dev)
···
 	if (ret)
 		goto finish_poll;
 
-	drm_fbdev_dma_setup(drm, 32);
+	drm_client_setup(drm, NULL);
 
 	dev_set_drvdata(dev, drm);