KVM: x86: Do not use kvm_x86_ops->mpx_supported() directly

Commit a87036ad ("KVM: x86: disable MPX if host did not enable
MPX XSAVE features") introduced kvm_mpx_supported() to return true
iff MPX is enabled in the host.

However, that commit seems to have missed replacing some calls to
kvm_x86_ops->mpx_supported() to kvm_mpx_supported().

Complete original commit by replacing remaining calls to
kvm_mpx_supported().

Fixes: a87036ad ("KVM: x86: disable MPX if host did not enable
MPX XSAVE features")
Suggested-by: Sean Christopherson <sean.j.christopherson@intel.com>
Signed-off-by: Liran Alon <liran.alon@oracle.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

arch/x86/kvm/vmx.c

@@ -12036,7 +12036,7 @@ static void prepare_vmcs02_full(struct kvm_vcpu *vcpu, struct vmcs12 *vmcs12)
 
 	set_cr4_guest_host_mask(vmx);
 
-	if (vmx_mpx_supported())
+	if (kvm_mpx_supported())
 		vmcs_write64(GUEST_BNDCFGS, vmcs12->guest_bndcfgs);
 
 	if (enable_vpid) {

arch/x86/kvm/x86.c

@@ -4698,7 +4698,7 @@ static void kvm_init_msr_list(void)
 		 */
 		switch (msrs_to_save[i]) {
 		case MSR_IA32_BNDCFGS:
-			if (!kvm_x86_ops->mpx_supported())
+			if (!kvm_mpx_supported())
 				continue;
 			break;
 		case MSR_TSC_AUX: