ARM: dts: aspeed: ethanolx: Add BIOS flash chip

Add a BIOS flash chip to the DTS to open a possibility to reflash the
main CPU BIOS from the BMC.

Signed-off-by: Konstantin Aladyshev <aladyshev22@gmail.com>
Link: https://lore.kernel.org/r/20230111113934.1176-1-aladyshev22@gmail.com


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