x86/cpu/amd: Move the errata checking functionality up

mainline inclusion
from mainline-v6.5-rc4
commit 8b6f6877
category: bugfix
bugzilla: https://gitee.com/src-openeuler/kernel/issues/I7T4O5
CVE: CVE-2023-20593

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=8b6f687743dacce83dbb0c7cfacf88bab00f808a



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

Avoid new and remove old forward declarations.

No functional changes.

Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Signed-off-by: liubaolin <liubaolin@kylinos.cn>