sensors: wrappers: deleted lsm303dlhx_magnetometer

Signed-off-by: Oskar Andero <oskar.andero@sonymobile.com>
sensors: wrappers: sync lsm303dlhx_compass.c

Sync lsm303dlhx_compass.c with latest internal changes.

Signed-off-by: Oskar Andero <oskar.andero@sonymobile.com>