Revert "KVM: MMU: show mmu_valid_gen in shadow page related tracepoints"

Revert "KVM: MMU: show mmu_valid_gen in shadow page related tracepoints"

...as part of removing x86 KVM's fast invalidate mechanism, i.e. this
is one part of a revert all patches from the series that introduced the
mechanism[1].

This reverts commit 2248b023219251908aedda0621251cffc548f258.

[1] https://lkml.kernel.org/r/1369960590-14138-1-git-send-email-xiaoguangrong@linux.vnet.ibm.com

Cc: Xiao Guangrong <guangrong.xiao@gmail.com>
Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>