iot: Grant all runtime permissions for installed apks.

Iot devices don't have user-installable apps. In addition, not all iot
devices have a screen. As such, it doesn't make sense to have runtime
permissions nor can users grant them in all cases.

Cherry-picked and adapted to depend on the FEATURE_EMBEDDED flag.

Bug: 31220981
Bug: 35804180
Test: manual test w/app

(cherry-picked from 1e577da550c523edea9bd23ef5a0baf221c936f8)

Change-Id: Ib3ca73660bc511ab68982b82327463801b583d0b