scsi: ufs: add command logging infrastructure

Add the necessary infrastructure to keep timestamp history
of commands, events and other useful info for debugging
complex issues. This helps in diagnosing events leading
upto failure.

Change-Id: I34f78b0c875262fa06c16d476be6255f7ae4d92f
Signed-off-by: Subhash Jadavani <subhashj@codeaurora.org>
Signed-off-by: Sayali Lokhande <sayalil@codeaurora.org>
[cang@codeaurora.org: fixed trivial merge conflicts and
compilation errors]
Signed-off-by: Can Guo <cang@codeaurora.org>