drm/exynos: drop drmP.h usage

Drop use of the deprecated drmP.h file.
Replace with forwards / externals as appropriate.

While touching the list of include files divide
them up in blocks and sort them.

v3:
- fix build errors in exynos_drm_g2d.c (Inki Dae)
  The exynos_drm_g2d.c file is not built in the
  standard configurations and was therefore missed.

Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
Cc: Inki Dae <inki.dae@samsung.com>
Cc: Joonyoung Shim <jy0922.shim@samsung.com>
Cc: Seung-Woo Kim <sw0312.kim@samsung.com>
Cc: Kyungmin Park <kyungmin.park@samsung.com>
Cc: David Airlie <airlied@linux.ie>
Cc: Daniel Vetter <daniel@ffwll.ch>
Cc: Kukjin Kim <kgene@kernel.org>
Cc: Krzysztof Kozlowski <krzk@kernel.org>
Cc: Jingoo Han <jingoohan1@gmail.com>
Fixed merge conflict.
Signed-off-by: Inki Dae <inki.dae@samsung.com>

drivers/gpu/drm/exynos/exynos_dp.c

@@ -6,25 +6,24 @@
  * Author: Jingoo Han <jg1.han@samsung.com>
  */
 
-#include <linux/module.h>
-#include <linux/platform_device.h>
-#include <linux/err.h>
 #include <linux/clk.h>
-#include <linux/of_graph.h>
 #include <linux/component.h>
+#include <linux/err.h>
+#include <linux/module.h>
+#include <linux/of_graph.h>
+#include <linux/platform_device.h>
 #include <linux/pm_runtime.h>
 #include <video/of_display_timing.h>
 #include <video/of_videomode.h>
 #include <video/videomode.h>
 
-#include <drm/drmP.h>
+#include <drm/bridge/analogix_dp.h>
 #include <drm/drm_atomic_helper.h>
 #include <drm/drm_crtc.h>
 #include <drm/drm_of.h>
 #include <drm/drm_panel.h>
+#include <drm/drm_print.h>
 #include <drm/drm_probe_helper.h>
-
-#include <drm/bridge/analogix_dp.h>
 #include <drm/exynos_drm.h>
 
 #include "exynos_drm_crtc.h"