KVM: Replace 'light_exits' stat with 'host_state_reload'

This is a little more accurate (since it counts actual reloads, not potential
reloads), and reverses the sense of the statistic to measure a bad event like
most of the other stats (e.g. we want to minimize all counters).

Signed-off-by: Avi Kivity <avi@qumranet.com>
diff --git a/drivers/kvm/kvm.h b/drivers/kvm/kvm.h
index 59e001c..04efe88 100644
--- a/drivers/kvm/kvm.h
+++ b/drivers/kvm/kvm.h
@@ -246,7 +246,7 @@
 	u32 halt_wakeup;
 	u32 request_irq_exits;
 	u32 irq_exits;
-	u32 light_exits;
+	u32 host_state_reload;
 	u32 efer_reload;
 };