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.c b/drivers/gpu/drm/vc4/vc4_drv.c
index 8639749..136bb42 100644
--- a/drivers/gpu/drm/vc4/vc4_drv.c
+++ b/drivers/gpu/drm/vc4/vc4_drv.c
@@ -31,7 +31,7 @@
 #include <linux/of_platform.h>
 #include <linux/platform_device.h>
 #include <linux/pm_runtime.h>
-#include "drm_fb_cma_helper.h"
+#include <drm/drm_fb_cma_helper.h>
 #include <drm/drm_fb_helper.h>
 
 #include "uapi/drm/vc4_drm.h"