ARM: dts: aspeed: everest, rainier: Add power-ffs-sync-history GPIO

The IBM Everest and Rainier systems have a GPIO line that goes to the
power supplies. It has a dual function: 1) Fans Full Speed, and 2) Sync
input history.

Signed-off-by: Brandon Wyman <bjwyman@gmail.com>
Link: https://lore.kernel.org/r/20220421213638.1151193-1-bjwyman@gmail.com


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