sh: Bring SMP support back from the dead.

There was a very preliminary bunch of SMP code scattered around for the
SH7604 microcontrollers from way back when, and it has mostly suffered
bitrot since then. With the tree already having been slowly getting
prepped for SMP, this plugs in most of the remaining platform-independent
bits.

Signed-off-by: Magnus Damm <damm@igel.co.jp>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>

arch/sh/kernel/traps.c

@@ -807,12 +807,13 @@ static inline void __init gdb_vbr_init(void)
 }
 #endif
 
-void __init per_cpu_trap_init(void)
+void __cpuinit per_cpu_trap_init(void)
 {
 	extern void *vbr_base;
 
 #ifdef CONFIG_SH_STANDARD_BIOS
-	gdb_vbr_init();
+	if (raw_smp_processor_id() == 0)
+		gdb_vbr_init();
 #endif
 
 	/* NOTE: The VBR value should be at P1