!312 intel: backport fix for SPR c1 and c1e independent support for intel_idle

Merge Pull Request from: @jiayingbao 
 
Intel-kernel issue:
https://gitee.com/openeuler/intel-kernel/issues/I64TXN

backport upstream 1548fac4 without change.
by this patch:

Removes commentary describing the old, and now non-existing SPR C1E
limitation.
Marks SPR C1E as available by default.
Removes the 'preferred_cstates' parameter handling for SPR. Both C1 and
C1E will be available regardless of 'preferred_cstates' value.
We expect that all SPR systems are shipping with new firmware, which includes
the C1/C1E improvement. 
 
Link:https://gitee.com/openeuler/kernel/pulls/312

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