arm64: dts: fix the i2c aliasing to match to schematics.

This patch fixes the i2c bus number aliasing so that it matches with the
schematics bus naming.

Without this patch the user might would get bus numbers depending on
the order the devices are probed.

Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
Signed-off-by: Andy Gross <andy.gross@linaro.org>