add global flags and arm optimizations

Change-Id: If083213b24147a7821f93fdf934009b21b088ae7
mcpu A15

Change-Id: Id55e4b7bd7f4b03d90754924d41c7bf1cd4bec3a
Remove cm.deps

Change-Id: Iddcd875277588146772e12a298da1ca5eb20ed28