x86: Move xen_post_allocator_init into xen_pagetable_setup_done

We really do not need two paravirt/x86_init_ops functions which are
called in two consecutive source lines. Move the only user of
post_allocator_init into the already existing pagetable_setup_done
function.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

arch/x86/kernel/setup.c

@@ -962,7 +962,6 @@ void __init setup_arch(char **cmdline_p)
 	x86_init.paging.pagetable_setup_start(swapper_pg_dir);
 	paging_init();
 	x86_init.paging.pagetable_setup_done(swapper_pg_dir);
-	paravirt_post_allocator_init();
 
 #ifdef CONFIG_X86_64
 	map_vsyscall();