add new ops to 32-bit.

based on:

 Subject: x86/pgtable: unify pagetable accessors
 From: Jeremy Fitzhardinge <jeremy@goop.org>
Signed-off-by: NIngo Molnar <mingo@elte.hu>
Signed-off-by: NThomas Gleixner <tglx@linutronix.de>