ARM: dts: aspeed: Rainier: Fix humidity sensor bus address

The si7021 was incorrectly placed at 0x20 on i2c bus 7. It is at 0x40.

Fixes: 9c44db70 ("ARM: dts: aspeed: rainier: Add i2c devices")
Signed-off-by: Eddie James <eajames@linux.ibm.com>
Reviewed-by: Joel Stanley <joel@jms.id.au>
Signed-off-by: Joel Stanley <joel@jms.id.au>

arch/arm/boot/dts/aspeed-bmc-ibm-rainier.dts

@@ -1201,9 +1201,9 @@ &i2c7 {
 	multi-master;
 	status = "okay";
 
-	si7021-a20@20 {
+	si7021-a20@40 {
 		compatible = "silabs,si7020";
-		reg = <0x20>;
+		reg = <0x40>;
 	};
 
 	tmp275@48 {