arm64: dts: qcom: sc7280: Move dp_hot_plug_det pull from SoC dtsi file

Pulls should be in the board files, not in the SoC dtsi
file. Remove. Even though the sc7280 boards don't currently refer to
dp_hot_plug_det, let's re-add the pulls there just to keep this as a
no-op change. If boards don't need this / don't want it later then we
can remove it from them.

Signed-off-by: Douglas Anderson <dianders@chromium.org>
Reviewed-by: Stephen Boyd <swboyd@chromium.org>
Reviewed-by: Matthias Kaehlcke <mka@chromium.org>
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Link: https://lore.kernel.org/r/20220202132301.v3.10.Id346b23642f91e16d68d75f44bcdb5b9fbd155ea@changeid