x86/microcode/intel: Rework intel_find_matching_signature()

mainline inclusion
from mainline-v6.7-rc1
commit b7fcd995b261c9976e05f47554529c98a0f1cbb0
category: feature
bugzilla: https://gitee.com/openeuler/intel-kernel/issues/I8XRMW


CVE: NA

--------------------------------

Take a cpu_signature argument and work from there. Move the match()
helper next to the callsite as there is no point for having it in
a header.

Intel-SIG: commit b7fcd995b261 x86/microcode/intel: Rework intel_find_matching_signature().
Microcode restructuring backport.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Link: https://lore.kernel.org/r/20231002115902.797820205@linutronix.de


[ Aubrey Li: amend commit log ]
Signed-off-by: Aubrey Li <aubrey.li@linux.intel.com>