arm64: dts: qcom: sc8280xp: fix USB MP QMP PHY nodes

Update the USB MP QMP PHY nodes to match the new binding which
specifically includes the missing register regions (e.g. PCS_USB).

Signed-off-by: Johan Hovold <johan+linaro@kernel.org>
Reviewed-by: Andrew Halaney <ahalaney@redhat.com>
Signed-off-by: Bjorn Andersson <andersson@kernel.org>
Link: https://lore.kernel.org/r/20221107081705.18446-1-johan+linaro@kernel.org