ARM: dts: aspeed: rainier: Remove PSU gpio-keys

Remove the gpio-keys entries for the power supply presence lines from
the Rainier device tree. The user space applications are going to change
from using libevdev to libgpiod.

Signed-off-by: B. J. Wyman <bjwyman@gmail.com>
Link: https://lore.kernel.org/r/20210623230401.3050076-1-bjwyman@gmail.com


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