dt-bindings: usb: qcom,dwc3: Add bindings for sm6115/4250

Add the compatible string for SM6115/4250 SoC from Qualcomm.

Reviewed-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Signed-off-by: Iskren Chernev <iskren.chernev@gmail.com>
Link: https://lore.kernel.org/r/20210622203240.559979-2-iskren.chernev@gmail.com


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>