Permission flag updates now notify listeners

Added a version of the onPermissionUpdated and
onInstallPermissionUpdated methods which will notify
OnPermissionChangedListeners, and added this to the
PermissionManagerService "updatePermissionFlags" and
"updatePermissionFlagsForAllApps" methods. Also adds
OnPermissionsChangedListener to @TestApi

Fixes: 135937566
Test: atest PermissionUpdateListenerTest
Change-Id: I906598c366234c3daaa202261678bca04837cb13