Revert "msm: pm-8x60: Merge msm_pm_idle_prepare into msm_pm_idle_enter"

This reverts commit 269e15494da6d37756e5c0253242dd72a3a28ebe. The
rs_limits flag isn't updated for the lowest power mode. It was fixed on
kernel 3.7 branch. Reverting this change would allow cherry-picking the
3.7 patch without any conflicts.

Change-Id: I7ac20b603bed34dc596eca9b3723b332e188d6d6
Signed-off-by: Mahesh Sivasubramanian <msivasub@codeaurora.org>
diff --git a/arch/arm/mach-msm/no-pm.c b/arch/arm/mach-msm/no-pm.c
index a8d4fdb..0db6e68 100644
--- a/arch/arm/mach-msm/no-pm.c
+++ b/arch/arm/mach-msm/no-pm.c
@@ -37,11 +37,15 @@
 
 void msm_pm_set_irq_extns(struct msm_pm_irq_calls *irq_calls) {}
 
-enum msm_pm_sleep_mode msm_pm_idle_enter(struct cpuidle_device *dev,
+int msm_pm_idle_prepare(struct cpuidle_device *dev,
 			struct cpuidle_driver *drv, int index)
 {
 	return -ENOSYS;
 }
 
-void msm_pm_enable_retention(bool enable) {}
+int msm_pm_idle_enter(enum msm_pm_sleep_mode sleep_mode)
+{
+	return -ENOSYS;
+}
 
+void msm_pm_enable_retention(bool enable) {}