drm/rockchip: make fbdev support really optional

Currently enabling Rockchip DRM support automatically pulls
in fbdev dependency. However this dep is unnecessary since
DRM core already handles this for us (DRM_FBDEV_EMULATION).
Signed-off-by: NTobias Jakobi <tjakobi@math.uni-bielefeld.de>
Signed-off-by: NSean Paul <seanpaul@chromium.org>

drivers/gpu/drm/rockchip/Kconfig

@@ -4,11 +4,7 @@ config DRM_ROCKCHIP
 	depends on RESET_CONTROLLER
 	select DRM_GEM_CMA_HELPER
 	select DRM_KMS_HELPER
-	select DRM_KMS_FB_HELPER
 	select DRM_PANEL
-	select FB_CFB_FILLRECT
-	select FB_CFB_COPYAREA
-	select FB_CFB_IMAGEBLIT
 	select VIDEOMODE_HELPERS
 	help
 	  Choose this option if you have a Rockchip soc chipset.