drm/i810: drop use of drmP.h

Drop use of the deprecated drmP.h header.
Replace with necessary includes.

Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
Acked-by: Emil Velikov <emil.velikov@collabora.com>
Cc: David Airlie <airlied@linux.ie>
Cc: Daniel Vetter <daniel@ffwll.ch>
Cc: Dan Carpenter <dan.carpenter@oracle.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20190716064220.18157-14-sam@ravnborg.org

drivers/gpu/drm/i810/i810_drv.h

@@ -32,7 +32,9 @@
 #ifndef _I810_DRV_H_
 #define _I810_DRV_H_
 
+#include <drm/drm_ioctl.h>
 #include <drm/drm_legacy.h>
+#include <drm/i810_drm.h>
 
 /* General customization:
  */