staging: vboxvideo: Cleanup header use

Stop adding -Iinclude/drm to the CFLAGS and stop using the obsolete
"include-all" drm/drmP.h header.
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/vboxvideo/Makefile

 # SPDX-License-Identifier: GPL-2.0
-ccflags-y := -Iinclude/drm
-
 vboxvideo-y :=  hgsmi_base.o modesetting.o vbva_base.o \
 		vbox_drv.o vbox_fb.o vbox_hgsmi.o vbox_irq.o vbox_main.o \
 		vbox_mode.o vbox_prime.o vbox_ttm.o

drivers/staging/vboxvideo/vbox_drv.c

@@ -11,7 +11,6 @@
 #include <linux/console.h>
 #include <linux/vt_kern.h>
 
-#include <drm/drmP.h>
 #include <drm/drm_crtc_helper.h>
 
 #include "vbox_drv.h"

drivers/staging/vboxvideo/vbox_drv.h

@@ -12,10 +12,10 @@
 
 #include <linux/genalloc.h>
 #include <linux/io.h>
+#include <linux/irqreturn.h>
 #include <linux/string.h>
 #include <linux/version.h>
 
-#include <drm/drmP.h>
 #include <drm/drm_encoder.h>
 #include <drm/drm_fb_helper.h>
 #include <drm/drm_gem.h>

drivers/staging/vboxvideo/vbox_fb.c

@@ -17,7 +17,6 @@
 #include <linux/fb.h>
 #include <linux/init.h>
 
-#include <drm/drmP.h>
 #include <drm/drm_crtc.h>
 #include <drm/drm_fb_helper.h>
 #include <drm/drm_crtc_helper.h>

drivers/staging/vboxvideo/vbox_ttm.c

@@ -6,8 +6,10 @@
  * Authors: Dave Airlie <airlied@redhat.com>
  *          Michael Thayer <michael.thayer@oracle.com>
  */
+#include <linux/pci.h>
+#include <drm/drm_file.h>
+#include <drm/ttm/ttm_page_alloc.h>
 #include "vbox_drv.h"
-#include <ttm/ttm_page_alloc.h>
 
 static inline struct vbox_private *vbox_bdev(struct ttm_bo_device *bd)
 {