iio: si7020: add support for Hoperf th06

This patch adds support for Hoperf th06 humidity and
temperature sensor as it uses same register definitions
as si7020

th06 Datasheet: http://www.hoperf.com/upload/sensor/TH06.pdf

Signed-off-by: Cristina Moraru <cristina.moraru09@gmail.com>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
diff --git a/drivers/iio/humidity/Kconfig b/drivers/iio/humidity/Kconfig
index 6382337..866dda1 100644
--- a/drivers/iio/humidity/Kconfig
+++ b/drivers/iio/humidity/Kconfig
@@ -51,7 +51,8 @@
 	depends on I2C
 	help
 	  Say yes here to build support for the Silicon Labs Si7013/20/21
-	  Relative Humidity and Temperature Sensors.
+	  Relative Humidity and Temperature Sensors. This driver also
+	  supports Hoperf TH06 Humidity and Temperature Sensor.
 
 	  To compile this driver as a module, choose M here: the module
 	  will be called si7020.