input: sensors: use work queue for mma8x5x data polling

Accelerometer mma8x5x driver register polling device for data
polling, but polling device only update polling interval on
new polling cycle, this will cause delay on change polling
interval in some case.

Change-Id: I391dc5507a40e6bfc7e8127a0db89cb685eaf192
Signed-off-by: Bingzhe Cai <bingzhec@codeaurora.org>