Add libchromeos/libpolicy GYP file

BUG=chromium:220003
TEST=Run emerge-<board> -v platform2 with and without platform2 USE
flag on a range of boards plus the host

Change-Id: I65a1fc8738070f7d8aa9b47e146b3f5860a0c7fd
Reviewed-on: https://gerrit.chromium.org/gerrit/38286
Reviewed-by: Mike Frysinger <vapier@chromium.org>
Commit-Queue: Liam McLoughlin <lmcloughlin@chromium.org>
Tested-by: Liam McLoughlin <lmcloughlin@chromium.org>
8 files changed