drm/nouveau: 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.
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/1493009447-31524-12-git-send-email-yamada.masahiro@socionext.com

drivers/gpu/drm/nouveau/Kbuild

-ccflags-y := -Iinclude/drm
 ccflags-y += -I$(src)/include
 ccflags-y += -I$(src)/include/nvkm
 ccflags-y += -I$(src)/nvkm

drivers/gpu/drm/nouveau/nouveau_drm.c

@@ -29,8 +29,8 @@
 #include <linux/pm_runtime.h>
 #include <linux/vga_switcheroo.h>
 
-#include "drmP.h"
-#include "drm_crtc_helper.h"
+#include <drm/drmP.h>
+#include <drm/drm_crtc_helper.h>
 
 #include <core/gpuobj.h>
 #include <core/option.h>

drivers/gpu/drm/nouveau/nouveau_drv.h

@@ -43,7 +43,7 @@
 #include <nvif/device.h>
 #include <nvif/ioctl.h>
 
-#include <drmP.h>
+#include <drm/drmP.h>
 
 #include <drm/ttm/ttm_bo_api.h>
 #include <drm/ttm/ttm_bo_driver.h>

drivers/gpu/drm/nouveau/nouveau_ttm.c

@@ -28,7 +28,7 @@
 #include "nouveau_ttm.h"
 #include "nouveau_gem.h"
 
-#include "drm_legacy.h"
+#include <drm/drm_legacy.h>
 
 #include <core/tegra.h>