setup_board: look up sdk targets only

We don't care about non-sdk targets when setting up the host boards,
so only load those for processing.

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

Change-Id: Ifa0f82a8c9704862a714fd9f35cbd11d809e295f
Reviewed-on: https://gerrit.chromium.org/gerrit/25626
Reviewed-by: Zdenek Behan <zbehan@chromium.org>
Commit-Ready: Mike Frysinger <vapier@chromium.org>
Tested-by: Mike Frysinger <vapier@chromium.org>
1 file changed