KVM: x86/pmu: Remove redundant check for MSR_IA32_DS_AREA set handler

After commit 2de154f541fc ("KVM: x86/pmu: Provide "error" semantics
for unsupported-but-known PMU MSRs"), the guest_cpuid_has(DS) check
is not necessary any more since if the guest supports X86_FEATURE_DS,
it never returns 1. And if the guest does not support this feature,
the set_msr handler will get false from kvm_pmu_is_valid_msr() before
reaching this point. Therefore, the check will not be true in all cases
and can be safely removed, which also simplifies the code and improves
its readability.

Signed-off-by: Jinrong Liang <cloudliang@tencent.com>
Link: https://lore.kernel.org/r/20230411130338.8592-1-cloudliang@tencent.com
Signed-off-by: Sean Christopherson <seanjc@google.com>

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