blackfin: smp: cleanup smp code

move idle task point to percpu blackfin_cpudata and add smp_timer_broadcast
interface.
enable SUPPLE_1_WAKEUP and add BFIN_IPI_TIMER ipi support.

Signed-off-by: Steven Miao <realmz6@gmail.com>
Signed-off-by: Bob Liu <lliubbo@gmail.com>
diff --git a/arch/blackfin/include/asm/cpu.h b/arch/blackfin/include/asm/cpu.h
index 0504378..e349631 100644
--- a/arch/blackfin/include/asm/cpu.h
+++ b/arch/blackfin/include/asm/cpu.h
@@ -14,6 +14,9 @@
 	struct cpu cpu;
 	unsigned int imemctl;
 	unsigned int dmemctl;
+#ifdef CONFIG_SMP
+	struct task_struct *idle;
+#endif
 };
 
 DECLARE_PER_CPU(struct blackfin_cpudata, cpu_data);