Revert "scsi: ufs: Make clock scaling path PM Safe"

This reverts commit 4d21c0e4e401b4eae406f656b57d8257a22e2f01 as
it may cause mutex lockup issue as per below stack.

  schedule_preempt_disabled+0x18/0x28
  __mutex_lock_common+0x5f8/0x1068
  mutex_lock_nested+0x40/0x50
  devfreq_monitor_suspend+0x24/0x68
  devfreq_simple_ondemand_handler+0x74/0x98
  devfreq_suspend_device+0x78/0x90
  ufshcd_suspend+0x138/0x870
  ufshcd_runtime_suspend+0x44/0x1f0
  ufshcd_pltfrm_runtime_suspend+0x1c/0x28
  pm_generic_runtime_suspend+0x34/0x48
  __rpm_callback+0x164/0x278
  rpm_suspend+0x4e4/0x828
  rpm_idle+0x5bc/0x600
  __pm_runtime_idle+0x84/0xa8
  ufshcd_devfreq_target+0x144/0x330
  update_devfreq+0xec/0x1c0
  devfreq_monitor+0x34/0x90

Hence Reverting this.

Change-Id: I189c2724acebafc60a5d8103039342751d9b4b1e
Signed-off-by: Nitin Rawat <[email protected]>
Signed-off-by: engstk <[email protected]>

drivers/scsi/ufs/ufshcd.c

@@ -1927,9 +1927,7 @@ static int ufshcd_devfreq_target(struct device *dev,
 	spin_unlock_irqrestore(hba->host->host_lock, irq_flags);
 
 	start = ktime_get();
-	pm_runtime_get_sync(hba->dev);
 	ret = ufshcd_devfreq_scale(hba, scale_up);
-	pm_runtime_put_sync(hba->dev);
 	trace_ufshcd_profile_clk_scaling(dev_name(hba->dev),
 		(scale_up ? "up" : "down"),
 		ktime_to_us(ktime_sub(ktime_get(), start)), ret);