ARM: dts: ast2500-evb: Add I2C devices

The EVB has an EEPROM on bus 3 and a LM75 temp sensor on bus 7. Enable
those busses we can test the I2C driver.

Signed-off-by: Joel Stanley <joel@jms.id.au>
Reviewed-by: Ryan Chen <ryan_chen@aspeedtech.com>

arch/arm/dts/ast2500-evb.dts

@@ -73,3 +73,22 @@
 	pinctrl-names = "default";
 	pinctrl-0 = <&pinctrl_sd2_default>;
 };
+
+&i2c3 {
+        status = "okay";
+
+        eeprom@50 {
+                compatible = "atmel,24c08";
+                reg = <0x50>;
+                pagesize = <16>;
+        };
+};
+
+&i2c7 {
+	status = "okay";
+
+        lm75@4d {
+                compatible = "national,lm75";
+                reg = <0x4d>;
+        };
+};