input: sensor: Modify filesystem node attribute for HAL access

Sensor HAL library control sensors by read/write certain filesystem
node. So we need to change the attribute of these filesystem node
in sensor driver that HAL layer can access them.

Change-Id: I7fc9f93ace78755e913e42145b88cd84de236584
Signed-off-by: Bingzhe Cai <bingzhec@codeaurora.org>
Signed-off-by: Pan Fang <fangpan@codeaurora.org>