When we touch gen8+ page maps, mark them dirty like we
do with previous gens.

v2: Update comment (Joonas)
Signed-off-by: NMika Kuoppala <mika.kuoppala@intel.com>
Reviewed-by: NJoonas Lahtinen <joonas.lahtinen@linux.intel.com>
Signed-off-by: NDaniel Vetter <daniel.vetter@ffwll.ch>