drm/radeon: drop use of drmP.h (1/2)

Drop use of drmP.h in all .c files named radeon*c.
To ease review a little drmP.h removal was divided in two commits.

Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Cc: "Christian König" <christian.koenig@amd.com>
Cc: "David (ChunMing) Zhou" <David1.Zhou@amd.com>
Cc: David Airlie <airlied@linux.ie>
Cc: Daniel Vetter <daniel@ffwll.ch>
Link: https://patchwork.freedesktop.org/patch/msgid/20190608080241.4958-7-sam@ravnborg.org

drivers/gpu/drm/radeon/radeon_agp.c

@@ -24,10 +24,14 @@
  *    Dave Airlie
  *    Jerome Glisse <glisse@freedesktop.org>
  */
-#include <drm/drmP.h>
-#include "radeon.h"
+
+#include <drm/drm_agpsupport.h>
+#include <drm/drm_device.h>
+#include <drm/drm_pci.h>
 #include <drm/radeon_drm.h>
 
+#include "radeon.h"
+
 #if IS_ENABLED(CONFIG_AGP)
 
 struct radeon_agpmode_quirk {