ARM: dts: aspeed: Add Bytedance g220a BMC machine

The g220a is a server platform with an ASPEED AST2500 BMC.

Signed-off-by: Lotus Xu <xuxiaohan@bytedance.com>
Signed-off-by: John Wang <wangzhiqiang.bj@bytedance.com>
Reviewed-by: Joel Stanley <joel@jms.id.au>
Link: https://lore.kernel.org/r/20200929063955.1206-2-wangzhiqiang.bj@bytedance.com


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