powerpc: Fix misleading small cores print

Currently when we boot on a big core system, we get this print:
  [    0.040500] Using small cores at SMT level

This is misleading as we've actually detected big cores.

This patch clears up the print to say we've detect big cores but are
using small cores for scheduling.
Signed-off-by: Michael Neuling <mikey@neuling.org>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20200528230731.1235752-1-mikey@neuling.org

arch/powerpc/kernel/smp.c

@@ -1383,7 +1383,7 @@ void __init smp_cpus_done(unsigned int max_cpus)
 
 #ifdef CONFIG_SCHED_SMT
 	if (has_big_cores) {
-		pr_info("Using small cores at SMT level\n");
+		pr_info("Big cores detected but using small core scheduling\n");
 		power9_topology[0].mask = smallcore_smt_mask;
 		powerpc_topology[0].mask = smallcore_smt_mask;
 	}