input: sensor: power down akm09911 sensor during suspend

To save more power, sensor needs power off during suspend and
sensor GPIOs also need to be properly configured.

CRs-fixed: 655099
Change-Id: Id47160e51a4e14464d66156731d3012eedd184d9
Signed-off-by: Bingzhe Cai <bingzhec@codeaurora.org>