ARM: dts: keystone2: add I2C aliases for davinci I2C nodes

Add aliases for I2C nodes required for the DM framework to probe the
davinci-i2c driver.

Signed-off-by: Franklin S Cooper Jr <fcooper@ti.com>
Reviewed-by: Tom Rini <trini@konsulko.com>
Reviewed-by: Heiko Schocher <hs@denx.de>

arch/arm/dts/keystone.dtsi

@@ -22,6 +22,9 @@
 		spi0 = &spi0;
 		spi1 = &spi1;
 		spi2 = &spi2;
+		i2c0 = &i2c0;
+		i2c1 = &i2c1;
+		i2c2 = &i2c2;
 	};
 
 	chosen {