Change ACCESS_AMBIENT_CONTEXT_EVENT permission protection level from "internal|role" to "signature|privileged|role". Add ACCESS_AMBIENT_CONTEXT_EVENT to the privapp-permissions allowlist for shell and systemui.

Bug: 194238130
Test: build in master and flash to device
Change-Id: I439e337515632b43f4c20d2fe4d1274b347a0bb1
3 files changed