ARM: dts: aspeed: mtjade: Remove gpio-keys entries

Remove the gpio-keys entries from the Ampere's Mt. Jade BMC device
tree. The user space applications are going to change from using
libevdev to libgpiod.

Signed-off-by: Quan Nguyen <quan@os.amperecomputing.com>
Link: https://lore.kernel.org/r/20220915080828.2894070-1-quan@os.amperecomputing.com


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