drm/xe: Fix build error in xe_ggtt.c

Need to include io-64-nonatomic-lo-hi.h for writeq function.
Commit 3121fed0 ("drm/xe: Cleanup some layering in GGTT")
removed the xe_mmio.h include so lost the indirect include.  Add it
where it's needed.

Fixes: 3121fed0 ("drm/xe: Cleanup some layering in GGTT")
Closes: https://lore.kernel.org/oe-kbuild-all/202402241903.R5J8hKVI-lkp@intel.com/Reported-by: kernel test robot <lkp@intel.com>
Signed-off-by: Matthew Brost <matthew.brost@intel.com>
Reviewed-by: Lucas De Marchi <lucas.demarchi@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20240225001448.81513-1-matthew.brost@intel.comSigned-off-by: Lucas De Marchi <lucas.demarchi@intel.com>

drivers/gpu/drm/xe/xe_ggtt.c

@@ -5,6 +5,7 @@
 
 #include "xe_ggtt.h"
 
+#include <linux/io-64-nonatomic-lo-hi.h>
 #include <linux/sizes.h>
 
 #include <drm/drm_managed.h>