udmabuf: sort headers, drop uapi/ path prefix

Reported-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Acked-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: http://patchwork.freedesktop.org/patch/msgid/20180911134216.9760-2-kraxel@redhat.com

drivers/dma-buf/udmabuf.c

 // SPDX-License-Identifier: GPL-2.0
-#include <linux/init.h>
-#include <linux/module.h>
+#include <linux/cred.h>
 #include <linux/device.h>
-#include <linux/kernel.h>
-#include <linux/slab.h>
-#include <linux/miscdevice.h>
 #include <linux/dma-buf.h>
 #include <linux/highmem.h>
-#include <linux/cred.h>
-#include <linux/shmem_fs.h>
+#include <linux/init.h>
+#include <linux/kernel.h>
 #include <linux/memfd.h>
-
-#include <uapi/linux/udmabuf.h>
+#include <linux/miscdevice.h>
+#include <linux/module.h>
+#include <linux/shmem_fs.h>
+#include <linux/slab.h>
+#include <linux/udmabuf.h>
 
 struct udmabuf {
 	u32 pagecount;