get toolchain info via cros_setup_toolchains

We want to centralize toolchain.conf parsing in cros_setup_toolchains.

BUG=None
TEST=`cbuildbot chromiumos-sdk` worked

Change-Id: I24c744e8bd2ededde3e4e119b6604bb3cc610729
Reviewed-on: https://gerrit.chromium.org/gerrit/24333
Reviewed-by: Mike Frysinger <vapier@chromium.org>
Tested-by: Mike Frysinger <vapier@chromium.org>
Commit-Ready: Mike Frysinger <vapier@chromium.org>
1 file changed