Revert "Revert "Refactor grant dialog to make more themeable""

This reverts commit 15990971.

Amended revert by deleting overlayable.xml

Reason for revert: The branch was using an out of date version of aapt2

Test: build mainline_modules_userdebug
Bug: 120435328
Change-Id: Ie54e53400bfdc8ac9ae7dc0b8e9680ead4708922