drm/vc4: fix include notation and remove -Iinclude/drm flag

Include <drm/*.h> instead of relative path from include/drm, then
remove the -Iinclude/drm compiler flag.

While we are here, use <...> instead of "..." for include/linux/*.h
and include/sound/*.h headers too.

Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: http://patchwork.freedesktop.org/patch/msgid/1495081793-9707-2-git-send-email-yamada.masahiro@socionext.com
diff --git a/drivers/gpu/drm/vc4/vc4_drv.h b/drivers/gpu/drm/vc4/vc4_drv.h
index 5ba2813..a97556f 100644
--- a/drivers/gpu/drm/vc4/vc4_drv.h
+++ b/drivers/gpu/drm/vc4/vc4_drv.h
@@ -6,12 +6,10 @@
  * published by the Free Software Foundation.
  */
 
-#include "drmP.h"
-#include "drm_gem_cma_helper.h"
-#include "drm_gem_cma_helper.h"
-
 #include <linux/reservation.h>
+#include <drm/drmP.h>
 #include <drm/drm_encoder.h>
+#include <drm/drm_gem_cma_helper.h>
 
 struct vc4_dev {
 	struct drm_device *dev;