Changeset 15951:ad339d88639d split policy_dir_prefix into
security_dir_prefix and policy_dir_prefix in acm code. I think this
needs to be reflected in the dummy module as well (otherwise we blowup
when bootloader.py tries to reference security.security_dir_prefix).
Fixed in below patch.
Signed-off-by: Alex Williamson <alex.williamson@hp.com>