arm64: dts: qcom: sm8450: switch PCIe QMP PHY to new style of bindings

arm64: dts: qcom: sm8450: switch PCIe QMP PHY to new style of bindings

Change the PCIe QMP PHY to use newer style of QMP PHY bindings (single
resource region, no per-PHY subnodes). As a part of this conversion also
change the "refgen" name to more correct "rchng".

Reviewed-by: Konrad Dybcio <konrad.dybcio@linaro.org>
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Link: https://lore.kernel.org/r/20230820142035.89903-18-dmitry.baryshkov@linaro.org
Signed-off-by: Bjorn Andersson <andersson@kernel.org>