arm64: dts: qcom: Add missing vdd-supply for QUSB2 PHY

QUSB2 PHY requires vdd-supply for digital circuit operation.  Add it for
platforms that miss it.

Signed-off-by: Shawn Guo <shawn.guo@linaro.org>
Acked-by: Vinod Koul <vkoul@kernel.org>
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Link: https://lore.kernel.org/r/20210928022002.26286-4-shawn.guo@linaro.org