ARM: at91: fix sam9n12 and sam9x5 arm_pm_idle

sam9n12 and sam9x5 don't set arm_pm_idle because of an oversight, fix that.
Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
Suggested-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Nicolas Ferre <nicolas.ferre@atmel.com>

arch/arm/mach-at91/at91sam9n12.c

@@ -15,6 +15,11 @@
 /* --------------------------------------------------------------------
  *  AT91SAM9N12 processor initialization
  * -------------------------------------------------------------------- */
+static void __init at91sam9n12_initialize(void)
+{
+	arm_pm_idle = at91sam9_idle;
+}
 
 AT91_SOC_START(at91sam9n12)
+	.init = at91sam9n12_initialize,
 AT91_SOC_END

arch/arm/mach-at91/at91sam9x5.c

@@ -16,5 +16,11 @@
  *  AT91SAM9x5 processor initialization
  * -------------------------------------------------------------------- */
 
+static void __init at91sam9x5_initialize(void)
+{
+	arm_pm_idle = at91sam9_idle;
+}
+
 AT91_SOC_START(at91sam9x5)
+	.init = at91sam9x5_initialize,
 AT91_SOC_END