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

For the C file, include <drm/*.h> instead of relative path from
include/drm.

For headers in include/drm/ttm, simplify the <tty/*.h> with "*.h".

This allows us to remove the -Iinclude/drm compiler flag from
drivers/gpu/drm/ttm/Makefile (and from other drivers' Makefiles).
Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Reviewed-by: Michel Dänzer <michel.daenzer@amd.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: http://patchwork.freedesktop.org/patch/msgid/1493009447-31524-3-git-send-email-yamada.masahiro@socionext.com

drivers/gpu/drm/ttm/Makefile

 #
 # Makefile for the drm device driver.  This driver provides support for the
 
-ccflags-y := -Iinclude/drm
 ttm-y := ttm_memory.o ttm_tt.o ttm_bo.o \
 	ttm_bo_util.o ttm_bo_vm.o ttm_module.o \
 	ttm_object.o ttm_lock.o ttm_execbuf_util.o ttm_page_alloc.o \

drivers/gpu/drm/ttm/ttm_bo_vm.c

@@ -30,9 +30,9 @@
 
 #define pr_fmt(fmt) "[TTM] " fmt
 
-#include <ttm/ttm_module.h>
-#include <ttm/ttm_bo_driver.h>
-#include <ttm/ttm_placement.h>
+#include <drm/ttm/ttm_module.h>
+#include <drm/ttm/ttm_bo_driver.h>
+#include <drm/ttm/ttm_placement.h>
 #include <drm/drm_vma_manager.h>
 #include <linux/mm.h>
 #include <linux/pfn_t.h>

include/drm/ttm/ttm_bo_driver.h

@@ -30,10 +30,6 @@
 #ifndef _TTM_BO_DRIVER_H_
 #define _TTM_BO_DRIVER_H_
 
-#include <ttm/ttm_bo_api.h>
-#include <ttm/ttm_memory.h>
-#include <ttm/ttm_module.h>
-#include <ttm/ttm_placement.h>
 #include <drm/drm_mm.h>
 #include <drm/drm_global.h>
 #include <drm/drm_vma_manager.h>
@@ -42,6 +38,11 @@
 #include <linux/spinlock.h>
 #include <linux/reservation.h>
 
+#include "ttm_bo_api.h"
+#include "ttm_memory.h"
+#include "ttm_module.h"
+#include "ttm_placement.h"
+
 #define TTM_MAX_BO_PRIORITY	4U
 
 struct ttm_backend_func {

include/drm/ttm/ttm_execbuf_util.h

@@ -31,9 +31,10 @@
 #ifndef _TTM_EXECBUF_UTIL_H_
 #define _TTM_EXECBUF_UTIL_H_
 
-#include <ttm/ttm_bo_api.h>
 #include <linux/list.h>
 
+#include "ttm_bo_api.h"
+
 /**
  * struct ttm_validate_buffer
  *

include/drm/ttm/ttm_lock.h

@@ -49,10 +49,11 @@
 #ifndef _TTM_LOCK_H_
 #define _TTM_LOCK_H_
 
-#include <ttm/ttm_object.h>
 #include <linux/wait.h>
 #include <linux/atomic.h>
 
+#include "ttm_object.h"
+
 /**
  * struct ttm_lock
  *

include/drm/ttm/ttm_object.h

@@ -42,7 +42,8 @@
 #include <linux/kref.h>
 #include <linux/rcupdate.h>
 #include <linux/dma-buf.h>
-#include <ttm/ttm_memory.h>
+
+#include "ttm_memory.h"
 
 /**
  * enum ttm_ref_type