arm64: dts: qcom: ipq6018: switch USB QMP PHY to new style of bindings

Change the USB QMP PHY to use newer style of QMP PHY bindings (single
resource region, no per-PHY subnodes).

Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Link: https://lore.kernel.org/r/20230824211952.1397699-8-dmitry.baryshkov@linaro.org
Signed-off-by: Bjorn Andersson <andersson@kernel.org>