arm64: dts: qcom: sm8350: correct USB phy unit address

Match unit-address to reg entry to fix dtbs W=1 warnings:

  Warning (simple_bus_reg): /soc@0/phy@88e9000: simple-bus unit address format error, expected "88e8000"

Fixes: 2458a305 ("arm64: dts: qcom: sm8350: switch to combo usb3/dp phy")
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Reviewed-by: Konrad Dybcio <konrad.dybcio@linaro.org>
Signed-off-by: Bjorn Andersson <andersson@kernel.org>
Link: https://lore.kernel.org/r/20230419211856.79332-15-krzysztof.kozlowski@linaro.org