Import opt3001 pristine kernel driver

linux_kernel_modules/opt3001/Kconfig

+
+#
+# Light sensors
+#
+# When adding new entries keep the list in alphabetical order
+
+menu "Light sensors"
+
+config OPT3001
+	tristate "Texas Instruments OPT3001 Light Sensor"
+	depends on I2C
+	help
+	  If you say Y or M here, you get support for Texas Instruments
+	  OPT3001 Ambient Light Sensor.
+
+	  If built as a dynamically linked module, it will be called
+	  opt3001.
+
+endmenu

linux_kernel_modules/opt3001/README

+Driver files were copied from https://github.com/torvalds/linux/tree/master/drivers/iio/light  in revision 4.18.10