ARM: dts: aspeed-ast2500: Add I2C devices

Enable the buses that are in use and the devices that are attached.
Currently that includes temperature measurement and EEPROM.
Reviewed-by: Brendan Higgins <brendanhiggins@google.com>
Reviewed-by: Andrew Jeffery <andrew@aj.id.au>
Signed-off-by: Joel Stanley <joel@jms.id.au>

arch/arm/boot/dts/aspeed-ast2500-evb.dts

@@ -59,3 +59,22 @@ &mac1 {
 	pinctrl-names = "default";
 	pinctrl-0 = <&pinctrl_rgmii2_default &pinctrl_mdio2_default>;
 };
+
+&i2c3 {
+	status = "okay";
+
+	eeprom@50 {
+		compatible = "atmel,24c08";
+		reg = <0x50>;
+		pagesize = <16>;
+	};
+};
+
+&i2c7 {
+	status = "okay";
+
+	lm75@4d {
+		compatible = "national,lm75";
+		reg = <0x4d>;
+	};
+};