KVM: x86/pmu: Provide Intel PMU's pmc_is_enabled() as generic x86 code

Move the Intel PMU implementation of pmc_is_enabled() to common x86 code
as pmc_is_globally_enabled(), and drop AMD's implementation.  AMD PMU
currently supports only v1, and thus not PERF_GLOBAL_CONTROL, thus the
semantics for AMD are unchanged.  And when support for AMD PMU v2 comes
along, the common behavior will also Just Work.

Signed-off-by: Like Xu <likexu@tencent.com>
Co-developed-by: Sean Christopherson <seanjc@google.com>
Link: https://lore.kernel.org/r/20230603011058.1038821-6-seanjc@google.com
Signed-off-by: Sean Christopherson <seanjc@google.com>

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