Enable testTapjackGrantDialog_partialOverlay on automotive

Automotive now supports preventing clicks while there's
a partial overlay.

Bug: 192088266
Test: atest CtsPermission3TestCases:android.permission3.cts.PermissionTapjackingTest on gcar_emu_x86_64-userdebug
Change-Id: I7156c7d8f272dd6780245bb138329e545c68b8cb
4 files changed