build:  Add USE_SET_METADATA tag

On some of the older devices the recovery doesn't support
metadata when setting permissions.  This allows to use
set_perm vs set_metadata you will need to set
USE_SET_METADATA := false inside your boardconfig.mk

Change-Id: Ib6cf97b5ca28cee8a87975231f3a61b156e77d29
Make CWM buildable and executable

Change-Id: Ib2bfd11a7f255e344e40e3aa718167896ea68c70