!840 intel: backport uncore-freq current frequency sysfs related patches

Merge Pull Request from: @jiayingbao 
 
there is new sysfs interface current_freq_khz added in upstream. Backport related patches for uncore-freq driver.

below 3 patches is backported: 
ae7b2ce5 platform/x86/intel/uncore-freq: Use sysfs API to create.
414eef27 platform/x86/intel/uncore-freq: Display uncore current frequency.
8d75f7b4 platform/x86: intel-uncore-freq: Prevent driver loading in guests.

test:
build pass
new sysfs current_freq_khz functional as expected 
 
Link:https://gitee.com/openeuler/kernel/pulls/840

 

Reviewed-by: Jason Zeng <jason.zeng@intel.com>
Reviewed-by: Aichun Shi <aichun.shi@intel.com>
Signed-off-by: Zheng Zengkai <zhengzengkai@huawei.com>