iio: light: jsa1212: Select REGMAP_I2C

This patch adds missing 'select' statement for jsa1212 driver.
Without regmap_i2c, we get the following error when loading the module:
Unknown symbol devm_regmap_init_i2c.
Signed-off-by: Roberta Dobrescu <roberta.dobrescu@gmail.com>
Reviewed-by: Daniel Baluta <daniel.baluta@intel.com>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>

drivers/iio/light/Kconfig

@@ -126,6 +126,7 @@ config HID_SENSOR_PROX
 config JSA1212
 	tristate "JSA1212 ALS and proximity sensor driver"
 	depends on I2C
+	select REGMAP_I2C
 	help
 	 Say Y here if you want to build a IIO driver for JSA1212
 	 proximity & ALS sensor device.