dt-bindings: display: Add hpd-gpios to panel-common bindings
In the cases where there is no connector in a system there's no great place to put "hpd-gpios". As per discussion [1] the best place to put it is in the panel. Add this to the device tree bindings. [1] https://lore.kernel.org/r/20200417180819.GE5861@pendragon.ideasonboard.comSigned-off-by: Douglas Anderson <dianders@chromium.org> Reviewed-by: Stephen Boyd <swboyd@chromium.org> Reviewed-by: Linus Walleij <linus.walleij@linaro.org> Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Signed-off-by: Sam Ravnborg <sam@ravnborg.org> Link: https://patchwork.freedesktop.org/patch/msgid/20200507143354.v5.2.I1976736b400a3b30e46efa47782248b86b3bc627@changeid
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