!200 x86: support MWAIT C1 as the default idle state

Merge Pull Request from: @haochengxie 
 
Two patches to support MWAIT C1 as the default idle state. For systems disabled global C-states in BIOS, kernel will use the default function as idle state. Historically, the default idle state uses HLT, but it should be mwait (if it support) to improve the exit latency.
 
 
Link:https://gitee.com/openeuler/kernel/pulls/200

 
Reviewed-by: Hanjun Guo <guohanjun@huawei.com>
Reviewed-by: Zheng Zengkai <zhengzengkai@huawei.com>
Signed-off-by: Zheng Zengkai <zhengzengkai@huawei.com>