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

This reverts commit 4d21c0e4 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 <nitirawa@codeaurora.org>