phy: qcom-ufs: don't probe for "dev_ref_clk_ctrl_mem"

This is handled in the ufs platform init. Drop the upstream
change that was missed in the ufs driver port to 4.4 kernel.

Change-Id: Ia3305f2b4f6c6eeafe3866833f2c98e186ad6632
Signed-off-by: Venkat Gopalakrishnan <venkatg@codeaurora.org>
[cang@codeaurora.org: resolved trivial merge conflicts]
Signed-off-by: Can Guo <cang@codeaurora.org>