input: sensors: clean up bosch bma2x2 accelerometer driver.

Do cleanup to fix all checkpatch error and fix obvious problem.

Change-Id: Ib9da1e97a220a935f7c73798db1d9c64306c01e9
Signed-off-by: Oliver Wang <mengmeng@codeaurora.org>
Signed-off-by: Bingzhe Cai <bingzhec@codeaurora.org>