drm/xe: Sort includes

Sort includes and split them in blocks:

1) .h corresponding to the .c. Example: xe_bb.c should have a "#include
   "xe_bb.h" first.
2) #include <linux/...>
3) #include <drm/...>
4) local includes
5) i915 includes

This is accomplished by running
`clang-format --style=file -i --sort-includes drivers/gpu/drm/xe/*.[ch]`
and ignoring all the changes after the includes. There are also some
manual tweaks to split the blocks.

v2: Also sort includes in headers

Signed-off-by: Lucas De Marchi <lucas.demarchi@intel.com>
Reviewed-by: Matthew Auld <matthew.auld@intel.com>
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>

drivers/gpu/drm/xe/xe_debugfs.c

@@ -3,13 +3,14 @@
  * Copyright © 2022 Intel Corporation
  */
 
+#include "xe_debugfs.h"
+
 #include <linux/string_helpers.h>
 
 #include <drm/drm_debugfs.h>
 
 #include "xe_bo.h"
 #include "xe_device.h"
-#include "xe_debugfs.h"
 #include "xe_gt_debugfs.h"
 #include "xe_step.h"