arm64: dts: qcom: msm8996: Move '#clock-cells' to QMP PHY child node

'#clock-cells' is a required property of QMP PHY child node, not itself.
Move it to fix the dtbs_check warnings.

There are only '#clock-cells' removal from SM8350 QMP PHY nodes, because
child nodes already have the property.

Signed-off-by: Shawn Guo <shawn.guo@linaro.org>
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Link: https://lore.kernel.org/r/20210929034253.24570-4-shawn.guo@linaro.org