32 and 64-bit use the same flags for pagetable entries, so make them all common.

[ mingo@elte.hu: fixes ]
Signed-off-by: NJeremy Fitzhardinge <jeremy@xensource.com>
Signed-off-by: NIngo Molnar <mingo@elte.hu>
Signed-off-by: NThomas Gleixner <tglx@linutronix.de>