dt-bindings: phy: qcom,*-qmp-ufs-phy: add clock-cells property

Add #clock-cells property to the QMP UFS PHYs to describe them as clock
providers. The QMP PHY provides rx and tx symbol clocks for the GCC.

Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Acked-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Signed-off-by: Abel Vesa <abel.vesa@linaro.org>
Link: https://lore.kernel.org/r/20221110151748.795767-2-dmitry.baryshkov@linaro.org