expressatt: fix build after new sensor updates

- reinclude bma250 accelerometer driver
- fix board files to work with new geomagnetic driver

Change-Id: Icda93ba91fad2130517fb82d0c08262cff385589
Merge "expressatt: fix build after new sensor updates" into cm-11.0
Merge branch 'cm-11.0' into kk_mkt