input: sensor: change name of light sensor device of stk3x1x

Change name of light sensor device that sensor HAL can distinguish
the device with other devices. Sensor HAL needs to distinguish different
devices because device drivers may use different sysfs interfaces and
may report different formats of data.

CRs-Fixed 524706
Change-Id: I3d2d31ef12c30abb9d884eda5b1248160aa2aceb
Signed-off-by: Bingzhe Cai <bingzhec@codeaurora.org>