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 --cc drivers/kvm/kvm.h
Simple merge

diff --cc drivers/kvm/svm.c
Simple merge

diff --cc drivers/kvm/vmx.c
Simple merge

diff --cc drivers/kvm/x86.c
Simple merge