[ssu-board-mappings] fix build bits

Change-Id: I753a42d658204cabe182971b0da86060b69c9fd5
Signed-off-by: Simonas Leleiva <simonas.leleiva@jollamobile.com>
Merge pull request #14 from sledges/boardmap-fixup

[ssu-board-mappings] fix build bits