Backport: enable LNA for CPE210

This patch massivly improves the wireless performance of CPE210

Signed-off-by: Tobias Klaus <tk+ff@meskal.net>
Tested-by: Tim Niemeyer <tim@tn-x.org>
Reviewed-by: Jan Kraus <mayosemmel@gmail.com>
Reviewed-by: Tim Niemeyer <tim@tn-x.org>