drm/gma500: drop drmP.h from header files

Drop use of drmp.h from all header files in drm/gma500.
Fix fallout in all files.
In some cases moved include lines and sorted them too.
With drmP.h removed from all header files it can now be removed from
each .c file without any further dependencies

Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
Cc: Patrik Jakobsson <patrik.r.jakobsson@gmail.com>
Cc: David Airlie <airlied@linux.ie>
Cc: Daniel Vetter <daniel@ffwll.ch>
Acked-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Signed-off-by: Patrik Jakobsson <patrik.r.jakobsson@gmail.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20190519195526.3422-3-sam@ravnborg.org

drivers/gpu/drm/gma500/intel_bios.h

@@ -22,8 +22,7 @@
 #ifndef _INTEL_BIOS_H_
 #define _INTEL_BIOS_H_
 
-#include <drm/drmP.h>
-#include <drm/drm_dp_helper.h>
+struct drm_device;
 
 struct vbt_header {
 	u8 signature[20];		/**< Always starts with 'VBT$' */