ARM: dts: aspeed: everest: PSU #3 address change

The third power supply had an I2C address conflict with another device
in the system. The device will have the address changed from 6Ah to 6Dh.

Signed-off-by: B. J. Wyman <bjwyman@gmail.com>
Reviewed-by: Eddie James <eajames@linux.ibm.com>
Link: https://lore.kernel.org/r/20210610202940.3650554-1-bjwyman@gmail.com
Fixes: d66d720b

 ("ARM: dts: aspeed: everest: Add power supply i2c devices")
Signed-off-by: Joel Stanley <joel@jms.id.au>