Fix "Allow/Deny" popup window no respond when enable pointer location

Currently, all buffered layers are included in input occlusion
calculations, the overlay window which can't receive input event
should also need to explicitly opt out by setting window type.

Bug: 158717144
Test: enable pointer location, launch app which would popup grant
      permission dialog
Change-Id: I0b56632c7299ca1074ded975f16c433266106d8a