input: sensors: pull down 8916SKUH sensor GPIOs for power saving

As sensor will power down during suspend, those GPIOs used by
sensors also need pull down to minimize leakage.

CRs-fixed: 655099
Change-Id: If9463e0cc89675204b9b4bee5eca2dd5a44515a5
Signed-off-by: Bingzhe Cai <bingzhec@codeaurora.org>