drm/xe/uapi: Remove unused inaccessible memory region

This is not used and also the negative of the other 2 regions:
native_mem_regions and slow_mem_regions.
Signed-off-by: Francois Dugast <francois.dugast@intel.com>
Reviewed-by: José Roberto de Souza <jose.souza@intel.com>
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>

include/uapi/drm/xe_drm.h

@@ -360,11 +360,6 @@ struct drm_xe_query_gt {
 	 * they live on a different GPU/Tile.
 	 */
 	__u64 slow_mem_regions;
-	/**
-	 * @inaccessible_mem_regions: Bit mask of instances from
-	 * drm_xe_query_mem_usage that is not accessible by this GT at all.
-	 */
-	__u64 inaccessible_mem_regions;
 	/** @reserved: Reserved */
 	__u64 reserved[8];
 };