ARM: mach-at91: move special idle code out of line

... and hook it to arm_pm_idle.

Signed-off-by: Nicolas Pitre <nicolas.pitre@linaro.org>
diff --git a/arch/arm/mach-at91/at91sam9rl.c b/arch/arm/mach-at91/at91sam9rl.c
index d6bcb1d..e009394 100644
--- a/arch/arm/mach-at91/at91sam9rl.c
+++ b/arch/arm/mach-at91/at91sam9rl.c
@@ -11,6 +11,7 @@
 
 #include <linux/module.h>
 
+#include <asm/proc-fns.h>
 #include <asm/irq.h>
 #include <asm/mach/arch.h>
 #include <asm/mach/map.h>
@@ -290,8 +291,15 @@
 	at91sam9_ioremap_smc(0, AT91SAM9RL_BASE_SMC);
 }
 
+static void at91sam9rl_idle(void)
+{
+	at91_sys_write(AT91_PMC_SCDR, AT91_PMC_PCK);
+	cpu_do_idle();
+}
+
 static void __init at91sam9rl_initialize(void)
 {
+	arm_pm_idle = at91sam9rl_idle;
 	arm_pm_restart = at91sam9_alt_restart;
 	at91_extern_irq = (1 << AT91SAM9RL_ID_IRQ0);