ARM: dts: aspeed: rainier: Label reset-cause-pinhole GPIO

This GPIO is used on the rainier system to indicate the BMC was reset
due to a physical pinhole reset.

See the following doc for more information:
https://github.com/openbmc/docs/blob/master/designs/device-tree-gpio-naming.md



Signed-off-by: Andrew Geissler <geissonator@yahoo.com>
Link: https://lore.kernel.org/r/20220113211735.37861-1-geissonator@yahoo.com


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