scsi: ufs: remove the query of ref_clk frequency

UFS device ref_clk frequency is set during the one time provisioning,
UFS driver just queries the reference clock frequency from device and
prints it out for informational purpose. Although this seems redundant
as incorrect reference clock frequency would anyway be detected during
bootup phase itself. This patch removes this redundant query and in turn
removes one message from going to serial console.

Change-Id: Id6a4d6d84b05f4b07b5299fd90e78e793e9689dc
Signed-off-by: Subhash Jadavani <subhashj@codeaurora.org>