dt-bindings: phy: qcom,usb-snps-femto-v2: use correct fallback for sc8180x

The qcom,sc8180x-usb-hs-phy device uses qcom,usb-snps-hs-7nm-phy
fallback. Correct the schema for this platform.

Fixes: 9160fb7c ("dt-bindings: phy: qcom,usb-snps-femto-v2: use fallback compatibles")
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Acked-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Link: https://lore.kernel.org/r/20240501-qcom-phy-fixes-v1-3-f1fd15c33fb3@linaro.org


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