KVM: selftests: Rename kvm_get_supported_cpuid_index() to __..._entry()

Rename kvm_get_supported_cpuid_index() to __kvm_get_supported_cpuid_entry()
to better show its relationship to kvm_get_supported_cpuid_entry(), and
because the helper returns a CPUID entry, not the index of an entry.

No functional change intended.
Signed-off-by: Sean Christopherson <seanjc@google.com>
Link: https://lore.kernel.org/r/20220614200707.3315957-37-seanjc@google.com

tools/testing/selftests/kvm/include/x86_64/processor.h

@@ -699,7 +699,7 @@ static inline void vcpu_clear_cpuid_feature(struct kvm_vcpu *vcpu,
 	vcpu_set_or_clear_cpuid_feature(vcpu, feature, false);
 }
 
-static inline const struct kvm_cpuid_entry2 *kvm_get_supported_cpuid_index(uint32_t function,
+static inline const struct kvm_cpuid_entry2 *__kvm_get_supported_cpuid_entry(uint32_t function,
 									     uint32_t index)
 {
 	return get_cpuid_entry(kvm_get_supported_cpuid(), function, index);
@@ -707,7 +707,7 @@ static inline const struct kvm_cpuid_entry2 *kvm_get_supported_cpuid_index(uint3
 
 static inline const struct kvm_cpuid_entry2 *kvm_get_supported_cpuid_entry(uint32_t function)
 {
-	return kvm_get_supported_cpuid_index(function, 0);
+	return __kvm_get_supported_cpuid_entry(function, 0);
 }
 
 uint64_t vcpu_get_msr(struct kvm_vcpu *vcpu, uint64_t msr_index);