When performing guest side polling, it is not necessary to
also perform host side polling.

So disable host side polling, via the new MSR interface,
when loading cpuidle-haltpoll driver.
Signed-off-by: NMarcelo Tosatti <mtosatti@redhat.com>
Signed-off-by: NRafael J. Wysocki <rafael.j.wysocki@intel.com>