Move sysUI contexts to system_ext am: 4862829753

Original change: https://googleplex-android-review.googlesource.com/c/device/google/zuma-sepolicy/+/23840925

Change-Id: I375b899f1d97c6c994a2f2392d562814e4c3a0d4
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>