Permissions: Don't autogrant all permissions on Android Things

Currently, we're auto granting all requested permissions on Android
Things devices. This cl moves us away from that and allows OEMs to use
the default-permissions flow to explicitly decide which dangerous
permissions they want each app in the OEM partition to have.

Bug: 73007742
Test: manual test
Change-Id: I0c33933c414ccd7b6f766790f2f7ebfebb1ddc4f