x86, NUMA: trivial cleanups

* Kill no longer used struct bootnode.

* Kill dangling declaration of pxm_to_nid() in numa_32.h.

* Make setup_node_bootmem() static.

Signed-off-by: Tejun Heo <tj@kernel.org>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Yinghai Lu <yinghai@kernel.org>
Cc: David Rientjes <rientjes@google.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: "H. Peter Anvin" <hpa@zytor.com>

arch/x86/mm/numa_64.c

@@ -95,7 +95,7 @@ int __init numa_add_memblk(int nid, u64 start, u64 end)
 }
 
 /* Initialize bootmem allocator for a node */
-void __init
+static void __init
 setup_node_bootmem(int nid, unsigned long start, unsigned long end)
 {
 	const u64 nd_low = (u64)MAX_DMA_PFN << PAGE_SHIFT;