base: added national roaming for YESS in Austria

http://jira.omnirom.org/browse/OMNI-259

Users of YESS in Austria (MCC 232 MNC 12) can roam on
A1 (MNC 01)

Change-Id: I354b3cbdf2d3a78612f5a79ae9254bf99b0e08d2
(cherry picked from commit 38024ec4c3633dc84bbb342783de264f73268bad)
Merge "base: added national roaming for YESS in Austria" into lollipop