ARM: da850-evm: Enable DM_I2C

With DM now enabled with the device tree pulled from Linux, we can
enable DM_I2C in U-Boot.

Reviewed-by: Jagan Teki <jagan@openedev.com>
Signed-off-by: Adam Ford <aford173@gmail.com>
[trini: Add DM_I2C_COMPAT to da850_am18xxevm to fix warning]
Signed-off-by: Tom Rini <trini@konsulko.com>

arch/arm/dts/da850-evm-u-boot.dtsi

@@ -13,6 +13,7 @@
 	};
 
 	aliases {
+		i2c0 = &i2c0;
 		spi0 = &spi1;
 	};
 };