ARM: dts: aspeed: mtjade: Enable secondary flash

Enable the secondary flash of the Ampere's Mt. Jade's BMC.

Signed-off-by: Quan Nguyen <quan@os.amperecomputing.com>
Signed-off-by: Thang Q. Nguyen <thang@os.amperecomputing.com>
Reviewed-by: Joel Stanley <joel@jms.id.au>
Link: https://lore.kernel.org/r/20220228000242.1884-2-quan@os.amperecomputing.com


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