x86/cpu/amd: Add a Zenbleed fix

stable inclusion
from stable-v4.19.289
commit cfef7bbf0dca27209ea5d82d7060d4fc2c0d72ea
category: bugfix
bugzilla: https://gitee.com/openeuler/kernel/issues/I7RC8S
CVE: NA

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=cfef7bbf0dca27209ea5d82d7060d4fc2c0d72ea



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

Upstream commit: 522b1d69

Add a fix for the Zen2 VZEROUPPER data corruption bug where under
certain circumstances executing VZEROUPPER can cause register
corruption or leak data.

The optimal fix is through microcode but in the case the proper
microcode revision has not been applied, enable a fallback fix using
a chicken bit.

Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Conflicts:
    arch/x86/include/asm/microcode_amd.h
    arch/x86/include/asm/msr-index.h
    arch/x86/kernel/cpu/amd.c
Signed-off-by: Wang ShaoBo <bobo.shaobowang@huawei.com>