arm64: dts: qcom: sc7180: Drop pinconf on dp_hot_plug_det

arm64: dts: qcom: sc7180: Drop pinconf on dp_hot_plug_det

We shouldn't put any pinconf here in case someone decides to invert this
HPD signal or remove an external pull-down. It's better to leave that to
the board pinconf nodes, so drop it here.

Reviewed-by: Douglas Anderson <dianders@chromium.org>
Reported-by: Douglas Anderson <dianders@chromium.org>
Cc: Tanmay Shah <tanmay@codeaurora.org>
Fixes: 681a607ad21a ("arm64: dts: qcom: sc7180: Add DisplayPort HPD pin dt node")
Signed-off-by: Stephen Boyd <swboyd@chromium.org>
Link: https://lore.kernel.org/r/20201215020004.731239-1-swboyd@chromium.org
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>