build: Add SKIP_SET_METADATA flag

Reapplied the patch as it got lost in the 4.4.3 merge

On some of the older devices the recovery doesn't support
metadata when setting permissions. This allows to use
set_perm vs set_metadata.
Enable this behavior by setting SKIP_SET_METADATA := true

Change-Id: Ib6cf97b5ca28cee8a87975231f3a61b156e77d29