KVM: arm64: PMU: fix kernel-doc warnings

Change 2 uses of "/**" on non-kernel-doc comments to common "/*"
comments to prevent kernel-doc warnings:

arch/arm64/kvm/pmu-emul.c:423: warning: This comment starts with '/**', but isn't a kernel-doc comment. Refer Documentation/doc-guide/kernel-doc.rst
 * When perf interrupt is an NMI, we cannot safely notify the vcpu corresponding
arch/arm64/kvm/pmu-emul.c:494: warning: This comment starts with '/**', but isn't a kernel-doc comment. Refer Documentation/doc-guide/kernel-doc.rst
 * When the perf event overflows, set the overflow status and inform the vcpu.

Signed-off-by: Randy Dunlap <rdunlap@infradead.org>
Cc: Marc Zyngier <maz@kernel.org>
Cc: Oliver Upton <oliver.upton@linux.dev>
Cc: James Morse <james.morse@arm.com>
Cc: Suzuki K Poulose <suzuki.poulose@arm.com>
Cc: Zenghui Yu <yuzenghui@huawei.com>
Cc: linux-arm-kernel@lists.infradead.org
Cc: kvmarm@lists.linux.dev
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Will Deacon <will@kernel.org>
Reviewed-by: Suzuki K Poulose <suzuki.poulose@arm.com>
Reviewed-by: Zenghui Yu <yuzenghui@huawei.com>
Link: https://lore.kernel.org/r/20240117230714.31025-7-rdunlap@infradead.org
Signed-off-by: Oliver Upton <oliver.upton@linux.dev>

Author: rddunlap

arch/arm64/kvm/pmu-emul.c

@@ -419,7 +419,7 @@ void kvm_pmu_sync_hwstate(struct kvm_vcpu *vcpu)
 	kvm_pmu_update_state(vcpu);
 }
 
-/**
+/*
  * When perf interrupt is an NMI, we cannot safely notify the vcpu corresponding
  * to the event.
  * This is why we need a callback to do it once outside of the NMI context.
@@ -490,7 +490,7 @@ static u64 compute_period(struct kvm_pmc *pmc, u64 counter)
 	return val;
 }
 
-/**
+/*
  * When the perf event overflows, set the overflow status and inform the vcpu.
  */
 static void kvm_pmu_perf_overflow(struct perf_event *perf_event,