ARM: at91: pm: Merge all at91sam9*_pm_init

The PM initialization is now identical for all at91sam9. Merge the
functions.

Acked-by: Wenyou Yang <wenyou.yang@atmel.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
diff --git a/arch/arm/mach-at91/pm.c b/arch/arm/mach-at91/pm.c
index a7c047f..dedfe90 100644
--- a/arch/arm/mach-at91/pm.c
+++ b/arch/arm/mach-at91/pm.c
@@ -505,19 +505,7 @@
 	at91_pm_init(at91rm9200_idle);
 }
 
-void __init at91sam9260_pm_init(void)
-{
-	at91_dt_ramc();
-	at91_pm_init(at91sam9_idle);
-}
-
-void __init at91sam9g45_pm_init(void)
-{
-	at91_dt_ramc();
-	at91_pm_init(at91sam9_idle);
-}
-
-void __init at91sam9x5_pm_init(void)
+void __init at91sam9_pm_init(void)
 {
 	at91_dt_ramc();
 	at91_pm_init(at91sam9_idle);