KVM: x86/pmu: Bypass perf checks when emulating mediated PMU counter accesses

When emulating a PMC counter read or write for a mediated PMU, bypass the
perf checks and emulated_counter logic as the counters aren't proxied
through perf, i.e. pmc->counter always holds the guest's up-to-date value,
and thus there's no need to defer emulated overflow checks.

Suggested-by: Sean Christopherson <seanjc@google.com>
Signed-off-by: Dapeng Mi <dapeng1.mi@linux.intel.com>
Co-developed-by: Mingwei Zhang <mizhang@google.com>
Signed-off-by: Mingwei Zhang <mizhang@google.com>
[sean: split from event filtering change, write shortlog+changelog]
Reviewed-by: Sandipan Das <sandipan.das@amd.com>
Tested-by: Xudong Hao <xudong.hao@intel.com>
Tested-by: Manali Shukla <manali.shukla@amd.com>
Link: https://patch.msgid.link/20251206001720.468579-24-seanjc@google.com
Signed-off-by: Sean Christopherson <seanjc@google.com>

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