ARM: at91: factorise duplicated at91sam9 idle

Remove duplicated at91sam9xxxx_idle() functions introduced
by commit c9dfafb "ARM: mach-at91: move special idle code out of line".
Replace by a generic at91sam9_idle() function in setup.c common
location.

Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
Acked-by: Nicolas Ferre <nicolas.ferre@atmel.com>
diff --git a/arch/arm/mach-at91/at91sam9rl.c b/arch/arm/mach-at91/at91sam9rl.c
index fd60e22..e86c50b 100644
--- a/arch/arm/mach-at91/at91sam9rl.c
+++ b/arch/arm/mach-at91/at91sam9rl.c
@@ -292,15 +292,9 @@
 	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_idle = at91sam9_idle;
 	arm_pm_restart = at91sam9_alt_restart;
 	at91_extern_irq = (1 << AT91SAM9RL_ID_IRQ0);