KVM: x86: remove stale comments

handle_external_intr does not enable interrupts anymore, vcpu_enter_guest
does it after calling guest_exit_irqoff.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

arch/x86/kvm/x86.c

@@ -6700,7 +6700,6 @@ static int vcpu_enter_guest(struct kvm_vcpu *vcpu)
 
 	kvm_put_guest_xcr0(vcpu);
 
-	/* Interrupt is enabled by handle_external_intr() */
 	kvm_x86_ops->handle_external_intr(vcpu);
 
 	++vcpu->stat.exits;