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_object.c

@@ -29,15 +29,18 @@
  *    Thomas Hellstrom <thomas-at-tungstengraphics-dot-com>
  *    Dave Airlie
  */
+
+#include <linux/io.h>
 #include <linux/list.h>
 #include <linux/slab.h>
-#include <drm/drmP.h>
-#include <drm/radeon_drm.h>
+
 #include <drm/drm_cache.h>
+#include <drm/drm_prime.h>
+#include <drm/radeon_drm.h>
+
 #include "radeon.h"
 #include "radeon_trace.h"
 
-
 int radeon_ttm_init(struct radeon_device *rdev);
 void radeon_ttm_fini(struct radeon_device *rdev);
 static void radeon_bo_clear_surface_reg(struct radeon_bo *bo);