add gtt_invalidate API to handle the GTT TLB flush instead of
hiding in write_pte64 function. This can avoid overkill when using
write_pte64
Suggested-by: NZhenyu Wang <zhenyuw@linux.intel.com>
Signed-off-by: NChuanxiao Dong <chuanxiao.dong@intel.com>
Cc: Zhenyu Wang <zhenyuw@linux.intel.com>
Signed-off-by: NZhenyu Wang <zhenyuw@linux.intel.com>