enabled neon-vfpv4 for a9 and a15 arch variant

Change-Id: I66c1cce7b0d02d7f38a1e52a5a9125d6e15f3ff5
compile with sabermod gcc 4.9

Change-Id: I0c3cca4a128ec67f45781a5aefdfab6cbf02a670