sh: convert online CPU map twiddling to cpumask.

This converts from cpu_set() for the online map to set_cpu_online().
The two online map modifiers were the last remaining manual map
manipulation bits, with this in place everything now goes through
cpumask.

Signed-off-by: Paul Mundt <lethal@linux-sh.org>
diff --git a/arch/sh/kernel/smp.c b/arch/sh/kernel/smp.c
index 2f348fd..cc87830 100644
--- a/arch/sh/kernel/smp.c
+++ b/arch/sh/kernel/smp.c
@@ -102,7 +102,7 @@
 
 	smp_store_cpu_info(cpu);
 
-	cpu_set(cpu, cpu_online_map);
+	set_cpu_online(cpu, true);
 
 	cpu_idle();
 }