scsi: ufs: add additional tracing messages

This patch adds following tracing messages:
 - Add support to trace the automatic background operations enable/disable
   events.
 - Add addition logs to trace the UFS device and UFS link state during
   suspend/resume and initialization.

Change-Id: I732b255296042442e50278c2700c52bd166e1d8b
Signed-off-by: Subhash Jadavani <subhashj@codeaurora.org>