drm/xe: Remove unnecessary drm_mm.h includes

These includes are no longer necessary, and where appropriate
are replaced by the linux/types.h one.

Reviewed-by: Jonathan Cavitt <[e-mail]>
Link: https://patchwork.freedesktop.org/patch/msgid/[e-mail]
Signed-off-by: Rodrigo Vivi <[e-mail]>

drivers/gpu/drm/xe/xe_migrate.h

···
 #ifndef _XE_MIGRATE_
 #define _XE_MIGRATE_
 
-#include <drm/drm_mm.h>
+#include <linux/types.h>
 
 struct dma_fence;
 struct iosys_map;

drivers/gpu/drm/xe/xe_res_cursor.h

···
 
 #include <linux/scatterlist.h>
 
-#include <drm/drm_mm.h>
 #include <drm/ttm/ttm_placement.h>
 #include <drm/ttm/ttm_range_manager.h>
 #include <drm/ttm/ttm_resource.h>

drivers/gpu/drm/xe/xe_ttm_stolen_mgr.c

···
  */
 
 #include <drm/drm_managed.h>
-#include <drm/drm_mm.h>
 
 #include <drm/ttm/ttm_device.h>
 #include <drm/ttm/ttm_placement.h>