input: sensors: fix akm8963 sensor check status

When akm8963 report data is read, fix the checking of the hardware
status. Now it is just checking the hardware status is overflow or not.

Change-Id: I41f4d400379c85e21b28529fb3469a6a9a9d19e3
CRs-Fixed: 725779
Signed-off-by: Daqing Chen <chendaqing@codeaurora.org>