dt-bindings: phy: qcom,sc8280xp-qmp-usb43dp: Reference usb-switch.yaml to allow mode-switch

The QMP USB3/DP Combo PHY can work in 3 modes:
- DisplayPort Only
- USB3 Only
- USB3 + DisplayPort Combo mode

In order to switch between those modes, the PHY needs to receive
Type-C events, allow marking to the phy with the mode-switch
property in order to allow the PHY to Type-C events.

Reference usb-switch.yaml as a simpler way to allow the mode-switch
property instead of duplicating the property definition.

Signed-off-by: Neil Armstrong <neil.armstrong@linaro.org>
Reviewed-by: Krzysztof Kozlowski <krzk@kernel.org>
Signed-off-by: Konrad Dybcio <konrad.dybcio@oss.qualcomm.com>
Tested-by: Neil Armstrong <neil.armstrong@linaro.org> # on Lenovo Thinkpad T14S
Link: https://lore.kernel.org/r/20250807-topic-4ln_dp_respin-v4-1-43272d6eca92@oss.qualcomm.com


Signed-off-by: Vinod Koul <vkoul@kernel.org>