drm/gem: Sort includes alphabetically

Sort includes alphabetically so it's easier to add/remove includes and
know when that is needed.
Signed-off-by: Lucas De Marchi <lucas.demarchi@intel.com>
Reviewed-by: Jani Nikula <jani.nikula@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20220126093951.1470898-9-lucas.demarchi@intel.com

drivers/gpu/drm/drm_gem.c

@@ -25,20 +25,20 @@
  *
  */
 
-#include <linux/types.h>
-#include <linux/slab.h>
-#include <linux/mm.h>
-#include <linux/uaccess.h>
-#include <linux/fs.h>
+#include <linux/dma-buf-map.h>
+#include <linux/dma-buf.h>
 #include <linux/file.h>
-#include <linux/module.h>
+#include <linux/fs.h>
+#include <linux/mem_encrypt.h>
+#include <linux/mm.h>
 #include <linux/mman.h>
+#include <linux/module.h>
 #include <linux/pagemap.h>
-#include <linux/shmem_fs.h>
-#include <linux/dma-buf.h>
-#include <linux/dma-buf-map.h>
-#include <linux/mem_encrypt.h>
 #include <linux/pagevec.h>
+#include <linux/shmem_fs.h>
+#include <linux/slab.h>
+#include <linux/types.h>
+#include <linux/uaccess.h>
 
 #include <drm/drm.h>
 #include <drm/drm_device.h>