KVM: x86: svm: remove unneeded nested_enable_evmcs() hook

Since commit 5158917 ("KVM: x86: nVMX: Allow nested_enable_evmcs to
be NULL") the code in x86.c is prepared to see nested_enable_evmcs being
NULL and in VMX case it actually is when nesting is disabled. Remove the
unneeded stub from SVM code.

Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com>
Reviewed-by: Jim Mattson <jmattson@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

arch/x86/kvm/svm.c

@@ -7099,13 +7099,6 @@ static int svm_unregister_enc_region(struct kvm *kvm,
 	return ret;
 }
 
-static int nested_enable_evmcs(struct kvm_vcpu *vcpu,
-				   uint16_t *vmcs_version)
-{
-	/* Intel-only feature */
-	return -ENODEV;
-}
-
 static bool svm_need_emulation_on_page_fault(struct kvm_vcpu *vcpu)
 {
 	unsigned long cr4 = kvm_read_cr4(vcpu);
@@ -7311,7 +7304,7 @@ static struct kvm_x86_ops svm_x86_ops __ro_after_init = {
 	.mem_enc_reg_region = svm_register_enc_region,
 	.mem_enc_unreg_region = svm_unregister_enc_region,
 
-	.nested_enable_evmcs = nested_enable_evmcs,
+	.nested_enable_evmcs = NULL,
 	.nested_get_evmcs_version = NULL,
 
 	.need_emulation_on_page_fault = svm_need_emulation_on_page_fault,