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.pdfSigned-off-by: NCristina Moraru <cristina.moraru09@gmail.com>
Signed-off-by: NJonathan Cameron <jic23@kernel.org>

drivers/iio/humidity/Kconfig

@@ -51,7 +51,8 @@ config SI7020
 	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.

drivers/iio/humidity/si7020.c

@@ -149,6 +149,7 @@ static int si7020_probe(struct i2c_client *client,
 
 static const struct i2c_device_id si7020_id[] = {
 	{ "si7020", 0 },
+	{ "th06", 0 },
 	{ }
 };
 MODULE_DEVICE_TABLE(i2c, si7020_id);