ipmi: add ipmi driver support

Sunway inclusion
category: feature
bugzilla: https://gitee.com/openeuler/kernel/issues/I56UPH



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Provide the KCS and BT of IPMI system interfaces that system software
uses for communication with BMC. Since hardware may occur default errors
due to lack of BMC hardware, these interface devices are disabled by
default.

To enable IPMI support, one may enable supported BT/KCS interfaces and
also select CONFIG_IPMI_HANDLER=y, CONFIG_IPMI_DEVICE_INTERFACE=y and
CONFIG_IPMI_SI=y.

Signed-off-by: Zhu Donghong <zhudonghong@wxiat.com>

Signed-off-by: Gu Zitao <guzitao@wxiat.com>
Acked-by: Xie XiuQi <xiexiuqi@huawei.com>
Signed-off-by: Zheng Zengkai <zhengzengkai@huawei.com>