x86/speculation: Update link to AMD speculation whitepaper

stable inclusion
from stable-v5.10.105
commit e335384560d1e106b609e8febd7e0427075a8938
category: bugfix
bugzilla: 186453 https://gitee.com/src-openeuler/kernel/issues/I50WBM
CVE: CVE-2022-0001

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=e335384560d1



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

commit e9b6013a upstream.

Update the link to the "Software Techniques for Managing Speculation
on AMD Processors" whitepaper.

Signed-off-by: Kim Phillips <kim.phillips@amd.com>
Signed-off-by: Borislav Petkov <bp@suse.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Chen Jiahao <chenjiahao16@huawei.com>
Reviewed-by: Liao Chang <liaochang1@huawei.com>
Signed-off-by: Zheng Zengkai <zhengzengkai@huawei.com>