ARM: dts: aspeed: g220a: Enable ipmb

Enable ipmb on i2c4.

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/20201211040002.1030-1-wangzhiqiang.bj@bytedance.com


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