ARM: dts: aspeed: mtjade: Add PSU support

Enable PSU support on Ampere's Mt. Jade BMC.

Signed-off-by: Quan Nguyen <quan@os.amperecomputing.com>
Signed-off-by: Phong Vo <phong@os.amperecomputing.com>
Signed-off-by: Thang Q. Nguyen <thang@os.amperecomputing.com>
Link: https://lore.kernel.org/r/20210517040036.13667-3-quan@os.amperecomputing.com


Signed-off-by: Joel Stanley <joel@jms.id.au>