ARM: dts: aspeed: amd-ethanolx: Update KCS nodes to use v2 binding

KCS nodes compatible property was changed in the dtsi to use v2 binding
before ethanolx was merged, making the ethanolx device tree incorrect.
Update it to use the new binding so the driver loads.

Fixes: fa4c8ec6 ("ARM: dts: aspeed: Change KCS nodes to v2 binding")
Signed-off-by: Konstantin Aladyshev <aladyshev22@gmail.com>
Reviewed-by: Joel Stanley <joel@jms.id.au>
Link: https://lore.kernel.org/r/20201027123722.2935-1-aladyshev22@gmail.com


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