drm/savage: drop use of drmP.h

Drop use of the deprecated drmP.h header file.
Replace it with the necessary includes of other headers.

Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
Reviewed-by: Daniel Vetter <daniel@ffwll.ch>
Cc: David Airlie <airlied@linux.ie>
Link: https://patchwork.freedesktop.org/patch/msgid/20190605140313.13629-3-sam@ravnborg.org

drivers/gpu/drm/savage/savage_state.c

@@ -22,8 +22,15 @@
  * CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  */
-#include <drm/drmP.h>
+
+#include <linux/slab.h>
+#include <linux/uaccess.h>
+
+#include <drm/drm_device.h>
+#include <drm/drm_file.h>
+#include <drm/drm_print.h>
 #include <drm/savage_drm.h>
+
 #include "savage_drv.h"
 
 void savage_emit_clip_rect_s3d(drm_savage_private_t * dev_priv,