x86/CPU/AMD: Move Zenbleed check to the Zen2 init function

x86/CPU/AMD: Move Zenbleed check to the Zen2 init function

[ Upstream commit f69759be251dce722942594fbc62e53a40822a82 ]

Prefix it properly so that it is clear which generation it is dealing
with.

No functional changes.

Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Link: http://lore.kernel.org/r/20231120104152.13740-8-bp@alien8.de
Stable-dep-of: c7b2edd8377b ("perf/x86/amd/core: Update and fix stalled-cycles-* events for Zen 2 and later")
Signed-off-by: Sasha Levin <sashal@kernel.org>