scsi: ufs: save and print current power info in the driver

There is no way to know the current working power info of the
driver, so in this patch, we save the power parameters, and we
print them to console.
This printing is necessary, since in case of crash, we can use those
logs to debug and investigate.

Change-Id: If0dc7a695c9b14a369e033e4c31787dcc2254ac3
Signed-off-by: Yaniv Gardi <ygardi@codeaurora.org>