x86-64, NUMA: Factor out memblk handling into numa_{add|register}_memblk()

Factor out memblk handling from srat_64.c into two functions in
numa_64.c.  This patch doesn't introduce any behavior change.  The
next patch will make all init methods use these functions.

- v2: Fixed build failure on 32bit due to misplaced NR_NODE_MEMBLKS.
      Reported by Ingo.

Signed-off-by: Tejun Heo <tj@kernel.org>
Cc: Yinghai Lu <yinghai@kernel.org>
Cc: Brian Gerst <brgerst@gmail.com>
Cc: Cyrill Gorcunov <gorcunov@gmail.com>
Cc: Shaohui Zheng <shaohui.zheng@intel.com>
Cc: David Rientjes <rientjes@google.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: H. Peter Anvin <hpa@linux.intel.com>

arch/x86/include/asm/numa_64.h

@@ -32,6 +32,8 @@ extern nodemask_t mem_nodes_parsed __initdata;
 extern struct bootnode numa_nodes[MAX_NUMNODES] __initdata;
 
 extern int __cpuinit numa_cpu_node(int cpu);
+extern int __init numa_add_memblk(int nodeid, u64 start, u64 end);
+extern int __init numa_register_memblks(void);
 
 #ifdef CONFIG_NUMA_EMU
 #define FAKE_NODE_MIN_SIZE	((u64)32 << 20)