iio: hid-sensors: Added ALS

Added usage id processing for ALS. This uses IIO
interfaces for triggered buffer to present data to user
mode.This uses HID sensor framework for registering callback
events from the sensor hub.

Signed-off-by: srinivas pandruvada <srinivas.pandruvada@intel.com>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
diff --git a/drivers/iio/Makefile b/drivers/iio/Makefile
index 761f2b6..f7fa3c0 100644
--- a/drivers/iio/Makefile
+++ b/drivers/iio/Makefile
@@ -18,4 +18,5 @@
 obj-y += dac/
 obj-y += common/
 obj-y += gyro/
+obj-y += light/
 obj-y += magnetometer/