arm64: dts: qcom: sc8280xp: fix USB PHY PCS registers

With the current binding, the PCS register block (0x1400) needs to
include the PCS_USB registers (0x1700).

Fixes: 152d1faf ("arm64: dts: qcom: add SC8280XP platform")
Signed-off-by: Johan Hovold <johan+linaro@kernel.org>
Signed-off-by: Bjorn Andersson <andersson@kernel.org>
Link: https://lore.kernel.org/r/20220919094454.1574-4-johan+linaro@kernel.org