KVM: x86/pmu: Rename global_ovf_ctrl_mask to global_status_mask

Rename global_ovf_ctrl_mask to global_status_mask to avoid confusion now
that Intel has renamed GLOBAL_OVF_CTRL to GLOBAL_STATUS_RESET in PMU v4.
GLOBAL_OVF_CTRL and GLOBAL_STATUS_RESET are the same MSR index, i.e. are
just different names for the same thing, but the SDM provides different
entries in the IA-32 Architectural MSRs table, which gets really confusing
when looking at PMU v4 definitions since it *looks* like GLOBAL_STATUS has
bits that don't exist in GLOBAL_OVF_CTRL, but in reality the bits are
simply defined in the GLOBAL_STATUS_RESET entry.

No functional change intended.

Cc: Like Xu <like.xu.linux@gmail.com>
Link: https://lore.kernel.org/r/20230603011058.1038821-2-seanjc@google.com
Signed-off-by: Sean Christopherson <seanjc@google.com>

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