scsi: ufs: read ref clk and icc level during init only

In order to minimize resume latency, pre-fetch
icc levels and reference clock during initialization
and avoid reading them each link startup
during resume.

Change-Id: Iab705068e46114eb3caa00c6e1b88a7862385d08
Signed-off-by: Noag <noag@codeaurora.org>