x86: don't clear nodes_states[N_NORMAL_MEMORY] when numa is not compiled in

Alex found that specjbb2005 still can not run with hugepages on an
x86-64 machine.  This only happens when numa is not compiled in.

The root cause: node_set_state will not set it back for us in that case,
so don't clear that when numa is not select in config

[ v2: use node_clear_state instead ]
Reported-and-Tested-by: Alex Shi <alex.shi@intel.com>
Signed-off-by: Yinghai Lu <yinghai@kernel.org>
Reviewed-by: Christoph Lameter <cl@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>