numa: remove stale node_has_online_mem() define

This isn't used anywhere, so delete it.

Looks like the last usage (in x86-specific code) was removed by Tejun
in 2011 in commit bd6709a9 ("x86, NUMA: Make 32bit use common NUMA
init path").
Signed-off-by: NChris Metcalf <cmetcalf@ezchip.com>

arch/tile/include/asm/topology.h

@@ -44,9 +44,6 @@ static inline const struct cpumask *cpumask_of_node(int node)
 /* For now, use numa node -1 for global allocation. */
 #define pcibus_to_node(bus)		((void)(bus), -1)
 
-/* By definition, we create nodes based on online memory. */
-#define node_has_online_mem(nid) 1
-
 #endif /* CONFIG_NUMA */
 
 #include <asm-generic/topology.h>

include/linux/topology.h

@@ -34,10 +34,6 @@
 #include <linux/percpu.h>
 #include <asm/topology.h>
 
-#ifndef node_has_online_mem
-#define node_has_online_mem(nid) (1)
-#endif
-
 #ifndef nr_cpus_node
 #define nr_cpus_node(node) cpumask_weight(cpumask_of_node(node))
 #endif