drm/stm: prepare for drmP.h removal from drm_modeset_helper.h

The use of drmP.h is discouraged and removal of it from
drm_modeset_helper.h caused drm/stm to fail to build.

This patch introduce the necessary fixes to prepare for the
drmP.h removal from drm_modeset_helper.h.

Build tested on arm and x86 allmodconfig

v2:
- sort list of include files
Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
Acked-by: Benjamin Gaignard <benjamin.gaignard@linaro.org>
Cc: Yannick Fertre <yannick.fertre@st.com>
Cc: Philippe Cornu <philippe.cornu@st.com>
Cc: Vincent Abriou <vincent.abriou@st.com>
Cc: David Airlie <airlied@linux.ie>
Cc: Daniel Vetter <daniel@ffwll.ch>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: https://patchwork.freedesktop.org/patch/msgid/20190119084014.5355-2-sam@ravnborg.org

drivers/gpu/drm/stm/drv.c

@@ -9,15 +9,19 @@
  */
 
 #include <linux/component.h>
+#include <linux/dma-mapping.h>
+#include <linux/module.h>
 #include <linux/of_platform.h>
 
 #include <drm/drm_atomic.h>
 #include <drm/drm_atomic_helper.h>
 #include <drm/drm_crtc_helper.h>
-#include <drm/drm_fb_helper.h>
+#include <drm/drm_drv.h>
 #include <drm/drm_fb_cma_helper.h>
+#include <drm/drm_fb_helper.h>
 #include <drm/drm_gem_cma_helper.h>
 #include <drm/drm_gem_framebuffer_helper.h>
+#include <drm/drm_vblank.h>
 
 #include "ltdc.h"
 

drivers/gpu/drm/stm/ltdc.c

@@ -10,18 +10,25 @@
 
 #include <linux/clk.h>
 #include <linux/component.h>
+#include <linux/delay.h>
+#include <linux/interrupt.h>
+#include <linux/module.h>
 #include <linux/of_address.h>
 #include <linux/of_graph.h>
+#include <linux/platform_device.h>
 #include <linux/reset.h>
 
 #include <drm/drm_atomic.h>
 #include <drm/drm_atomic_helper.h>
+#include <drm/drm_bridge.h>
 #include <drm/drm_crtc_helper.h>
+#include <drm/drm_device.h>
 #include <drm/drm_fb_cma_helper.h>
+#include <drm/drm_fourcc.h>
 #include <drm/drm_gem_cma_helper.h>
 #include <drm/drm_of.h>
-#include <drm/drm_bridge.h>
 #include <drm/drm_plane_helper.h>
+#include <drm/drm_vblank.h>
 
 #include <video/videomode.h>