x86/ucode/AMD: late load the patch on every logical thread

x86/ucode/AMD: late load the patch on every logical thread

Currently late ucode loading is performed only on the first core of CPU
siblings.  But according to the latest recommendation from AMD, late
ucode loading should happen on every logical thread/core on AMD CPUs.

To achieve that, introduce is_cpu_primary() helper which will consider
every logical cpu as "primary" when running on AMD CPUs.  Also include
Hygon in the check for future-proofing.

Signed-off-by: Sergey Dyasli <sergey.dyasli@citrix.com>
Reviewed-by: Jan Beulich <jbeulich@suse.com>
master commit: f1315e48a03a42f78f9b03c0a384165baf02acae
master date: 2023-02-28 14:51:28 +0100