The 'idmap --scan' command was limited to only scan a single directory for overlay packages. Update idmap to support any number of directories. Change-Id: I851f5720a3c1d844235911a0833670652a20a3c8
idmap depends on libandroidfw, so it should go in frameworks/base. Change-Id: I3c1db3baa355f53d6b523d60f4377e63eff00c30