i2c-axxia: Fixed i2c device minor numbers

Added missing 'bus' property to the I2C device tree nodes (simulation dts
files). This is needed to get the I2C adapters numbered starting with 0.

Signed-off-by: Anders Berg <anders.berg@lsi.com>
arch/powerpc: Temporary Configuration for 3500 with Preempt-RT

Signed-off-by: John Jacques <john.jacques@lsi.com>