ARM: dts: qcom: msm8974: drop unit addresses from USB phys

The ulpi node does not allow children to have unit address:

  Warning (unit_address_vs_reg): /soc/usb@f9a55000/ulpi/phy@a: node has a unit name, but no reg or ranges property

Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Reviewed-by: Konrad Dybcio <konrad.dybcio@linaro.org>
Signed-off-by: Bjorn Andersson <andersson@kernel.org>
Link: https://lore.kernel.org/r/20230420065318.23503-1-krzysztof.kozlowski@linaro.org