ARM: dts: uniphier: add I2C aliases for ProXstream2 boards

Add aliases to fix the I2C indexes like the other UniPhier boards.

Signed-off-by: Masahiro Yamada <[e-mail]>
Signed-off-by: Olof Johansson <[e-mail]>

arch/arm/boot/dts/uniphier-proxstream2-gentil.dts

···
 		serial0 = &serial0;
 		serial1 = &serial1;
 		serial2 = &serial2;
+		i2c0 = &i2c0;
+		i2c4 = &i2c4;
+		i2c5 = &i2c5;
+		i2c6 = &i2c6;
 	};
 };
 

arch/arm/boot/dts/uniphier-proxstream2-vodka.dts

···
 		serial0 = &serial0;
 		serial1 = &serial1;
 		serial2 = &serial2;
+		i2c0 = &i2c0;
+		i2c4 = &i2c4;
+		i2c5 = &i2c5;
+		i2c6 = &i2c6;
 	};
 };