drm/fsl-dcu: make fbdev support really optional

Currently enabling Freescale DCU 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: Tobias Jakobi <tjakobi@math.uni-bielefeld.de>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: http://patchwork.freedesktop.org/patch/msgid/1468586897-32298-14-git-send-email-tjakobi@math.uni-bielefeld.de

drivers/gpu/drm/fsl-dcu/Kconfig

@@ -5,12 +5,7 @@ config DRM_FSL_DCU
 	select BACKLIGHT_LCD_SUPPORT
 	select DRM_KMS_HELPER
 	select DRM_KMS_CMA_HELPER
-	select DRM_KMS_FB_HELPER
 	select DRM_PANEL
-	select FB_SYS_FILLRECT
-	select FB_SYS_COPYAREA
-	select FB_SYS_IMAGEBLIT
-	select FB_SYS_FOPS
 	select REGMAP_MMIO
 	select VIDEOMODE_HELPERS
 	help