arm64: dts: qcom: msm8996: clean up PCIe PHY node

Clean up the PCIe PHY node by renaming the wrapper node and grouping the
child node properties.

Signed-off-by: Johan Hovold <johan+linaro@kernel.org>
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Link: https://lore.kernel.org/r/20220705114032.22787-15-johan+linaro@kernel.org