x86/microcode/hygon: Add microcode loading support for Hygon processors

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


CVE: NA

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Add support for loading Hygon microcode, which is compatible with AMD one.

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