mm: add HAVE_MEMBLOCK_NODE_MAP support

ARCH_POPULATES_NODE_MAP in 3.0 is replaced by HAVE_MEMBLOCK_NODE_MAP in
3.4.  add_active_range() is replaced with memblock_set_node().  They do
basically the same thing, but embedding nid field into memblock_region
is much cleaner than a separate early_node_map.

HAVE_MEMBLOCK_NODE_MAP is not selected by default.

See commit 4a2164a7 for more info.

Change-Id: Icb44a8cea365b2d32df80628a57535a3d46fbd55
Signed-off-by: Junjie Wu <junjiew@codeaurora.org>