KVM: MIPS: use true,false for bool variable

Fix the following coccicheck warning:

arch/mips/kvm/mips.c:82:1-28: WARNING: Assignment of 0/1 to bool
variable
arch/mips/kvm/mips.c:88:1-28: WARNING: Assignment of 0/1 to bool
variable
Signed-off-by: Jason Yan <yanaijie@huawei.com>
Signed-off-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de>

arch/mips/kvm/mips.c

@@ -80,13 +80,13 @@ bool kvm_trace_guest_mode_change;
 
 int kvm_guest_mode_change_trace_reg(void)
 {
-	kvm_trace_guest_mode_change = 1;
+	kvm_trace_guest_mode_change = true;
 	return 0;
 }
 
 void kvm_guest_mode_change_trace_unreg(void)
 {
-	kvm_trace_guest_mode_change = 0;
+	kvm_trace_guest_mode_change = false;
 }
 
 /*