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>
diff --git a/drivers/input/misc/Kconfig b/drivers/input/misc/Kconfig
index a052bd3..aaa2fc8 100644
--- a/drivers/input/misc/Kconfig
+++ b/drivers/input/misc/Kconfig
@@ -692,4 +692,16 @@
 	default "0"
 	help
 	  this provide the sensor position setting , value is between 0~7
+
+config SENSORS_STK3X1X
+	tristate "STK3X1X device driver"
+	depends on I2C
+	default n
+	help
+	  Say Y here you want to enable for the sitronix stk3x1x
+	  light and proximity sensors driver.
+
+	  To compile this driver as a module, choose M here: the
+	  module will be called stk3x1x.
+
 endif
diff --git a/drivers/input/misc/Makefile b/drivers/input/misc/Makefile
index 4f29e05..445fba0 100644
--- a/drivers/input/misc/Makefile
+++ b/drivers/input/misc/Makefile
@@ -64,3 +64,4 @@
 obj-$(CONFIG_BMP18X)			+= bmp18x-core.o
 obj-$(CONFIG_BMP18X_I2C)		+= bmp18x-i2c.o
 obj-$(CONFIG_SENSORS_MMA8X5X)	  	+= mma8x5x.o
+obj-$(CONFIG_SENSORS_STK3X1X)		+= stk3x1x.o