drm/stm: ltdc: Add panel-bridge support

Add the panel-bridge support for both panels & bridges (used by DSI host &
HDMI/LVDS bridges).

Signed-off-by: Philippe CORNU <philippe.cornu@st.com>
Reviewed-by: Archit Taneja <architt@codeaurora.org>
Signed-off-by: Archit Taneja <architt@codeaurora.org>
Link: https://patchwork.freedesktop.org/patch/msgid/1500277223-29553-3-git-send-email-philippe.cornu@st.com

drivers/gpu/drm/stm/Kconfig

@@ -4,7 +4,7 @@ config DRM_STM
 	select DRM_KMS_HELPER
 	select DRM_GEM_CMA_HELPER
 	select DRM_KMS_CMA_HELPER
-	select DRM_PANEL
+	select DRM_PANEL_BRIDGE
 	select VIDEOMODE_HELPERS
 	select FB_PROVIDE_GET_FB_UNMAPPED_AREA
 	default y