arm64: dts: qcom: msm8998-yoshino: Add USB extcon

While not strictly necessary, at least on maple, configure the USB extcon,
which requires two pins on Yoshino.

Signed-off-by: Konrad Dybcio <konrad.dybcio@somainline.org>
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Link: https://lore.kernel.org/r/20220430162353.607709-5-konrad.dybcio@somainline.org