phy: qcom-ufs: Update documentation for ref_clk
Per newer UFS PHY design, some platforms may not have the ON/OFF control
for reference clock, hence this clock may be optional.
Change-Id: I13c4bf671716d5ad5bc4100a2155a77d541181c3
Signed-off-by:
Can Guo <cang@codeaurora.org>
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