x86: Move paravirt pagetable_setup to x86_init_ops

Replace more paravirt hackery by proper x86_init_ops.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
diff --git a/arch/x86/xen/mmu.h b/arch/x86/xen/mmu.h
index da73026..5fe6bc7 100644
--- a/arch/x86/xen/mmu.h
+++ b/arch/x86/xen/mmu.h
@@ -59,5 +59,5 @@
 
 unsigned long xen_read_cr2_direct(void);
 
-extern const struct pv_mmu_ops xen_mmu_ops;
+extern void xen_init_mmu_ops(void);
 #endif	/* _XEN_MMU_H */