Revert "KVM: Simplify kvm->tlbs_dirty handling"

This reverts commit 5befdc385ddb2d5ae8995ad89004529a3acf58fc.

Since we will allow flush tlb out of mmu-lock in the later
patch

Signed-off-by: Xiao Guangrong <xiaoguangrong@linux.vnet.ibm.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>

diff --cc arch/x86/kvm/paging_tmpl.h
Simple merge

diff --cc include/linux/kvm_host.h
Simple merge

diff --cc virt/kvm/kvm_main.c
Simple merge