Framework: Enable multi-user support for Quiet Hours

Change-Id: Ica967ff6bf5842a08421583449876ba73de13d51
Framework: Fix multi-user support in AudioService

Change-Id: Iddeeeac0734a237103e238bcdaa1e85806a64e4f
PackageManager: Restrict system packages to protected storage

Don't allow packages signed with the platform key to be
installed into user (or app) controlled storage

Change-Id: I7390b3bdf5289411f7a335c69635bed9f74bbfb3