scsi: ufs: add time profiling support

This patch adds the profiling support for some of the time critical
operations like hibern8 enter/exit, clock gating & clock scaling.

Change-Id: I4dde1078dcd2af47f051639b03c44c423ee344fa
Signed-off-by: Subhash Jadavani <subhashj@codeaurora.org>