drivers: input: akm8963: Initialize AKECS_ioctl vars

From m7stockui-3.4.10-gef77362.

Change-Id: Ic1b80479c6a7ca60e19ec741f840379dbf6516ad
(cherry picked from commit f7f048aad0e89141296251642e6c765efaf3648a)
Merge CyanogenMod/cm-12.0 into cm-12.0