input: sensor: add kconfig and makefile entity for stk3x1x driver

Kconfig and makefile entity is required to build Sitronix stk3x1x
light/proximity sensor driver.

Change-Id: I8a64d6b11ef7bae72af09744346ab90b762e1c33
Signed-off-by: Bingzhe Cai <bingzhec@codeaurora.org>
2 files changed