arm64: dts: qcom: x1e80100: Fix PHY for DP2

arm64: dts: qcom: x1e80100: Fix PHY for DP2

The actual PHY used by MDSS DP2 is the USB SS2 QMP one. So switch to it
instead. This is needed to get external DP support on boards like CRD
where the 3rd Type-C USB port (right-hand side) is connected to DP2.

Fixes: 1940c25eaa63 ("arm64: dts: qcom: x1e80100: Add display nodes")
Signed-off-by: Abel Vesa <abel.vesa@linaro.org>
Reviewed-by: Konrad Dybcio <konradybcio@kernel.org>
Link: https://lore.kernel.org/r/20240829-x1e80100-dts-dp2-use-qmpphy-ss2-v1-1-9ba3dca61ccc@linaro.org
Signed-off-by: Bjorn Andersson <andersson@kernel.org>