input: misc: turn off mma8x5x device power while disabled

Disable device regulators for power saving while device is not in
active state.

CRs-Fixed: 547435
Change-Id: I0984ef75e927d1b8e177782503bb3b2cfa8fa987
Signed-off-by: Bingzhe Cai <bingzhec@codeaurora.org>