powerpc/numa: remove prrn_is_enabled()

All users of this prrn_is_enabled() are gone; remove it.
Signed-off-by: Nathan Lynch <nathanl@linux.ibm.com>
Reviewed-by: Srikar Dronamraju <srikar@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20200612051238.1007764-14-nathanl@linux.ibm.com

arch/powerpc/include/asm/topology.h

@@ -93,13 +93,8 @@ static inline int cpu_distance(__be32 *cpu1_assoc, __be32 *cpu2_assoc)
 #endif /* CONFIG_NUMA */
 
 #if defined(CONFIG_NUMA) && defined(CONFIG_PPC_SPLPAR)
-extern int prrn_is_enabled(void);
 extern int find_and_online_cpu_nid(int cpu);
 #else
-static inline int prrn_is_enabled(void)
-{
-	return 0;
-}
 static inline int find_and_online_cpu_nid(int cpu)
 {
 	return 0;

arch/powerpc/mm/numa.c

@@ -1210,11 +1210,6 @@ int arch_update_cpu_topology(void)
 	return numa_update_cpu_topology(true);
 }
 
-int prrn_is_enabled(void)
-{
-	return 0;
-}
-
 static int topology_update_init(void)
 {
 	topology_inited = 1;