x86/cpu: Get LLC ID for Hygon family 18h model 5h

hygon inclusion
category: feature
bugzilla: https://gitee.com/openeuler/kernel/issues/I7DX6V


CVE: NA

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Add support to calculate LLC ID from the number of threads sharing
the cache for Hygon family 18h model 5h processor.

Signed-off-by: Pu Wen <puwen@hygon.cn>