x86/paravirt: Remove paravirt ops pmd_update[_defer] and pte_update_defer

x86/paravirt: Remove paravirt ops pmd_update[_defer] and pte_update_defer

pte_update_defer can be removed as it is always set to the same
function as pte_update. So any usage of pte_update_defer() can be
replaced by pte_update().

pmd_update and pmd_update_defer are always set to paravirt_nop, so they
can just be nuked.

Signed-off-by: Juergen Gross <jgross@suse.com>
Acked-by: Rusty Russell <rusty@rustcorp.com.au>
Cc: jeremy@goop.org
Cc: chrisw@sous-sol.org
Cc: akataria@vmware.com
Cc: virtualization@lists.linux-foundation.org
Cc: xen-devel@lists.xen.org
Cc: konrad.wilk@oracle.com
Cc: david.vrabel@citrix.com
Cc: boris.ostrovsky@oracle.com
Link: http://lkml.kernel.org/r/1447771879-1806-1-git-send-email-jgross@suse.com
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>