drm/panel-simple: Non-eDP panels don't need "HPD" handling
All of the "HPD" handling added to panel-simple recently was for eDP panels. Remove it from panel-simple now that panel-edp handles eDP panels. The "prepare_to_enable" delay only makes sense in the context of HPD, so remove it too. No non-eDP panels used it anyway. Signed-off-by: Douglas Anderson <dianders@chromium.org> Acked-by: Sam Ravnborg <sam@ravnborg.org> Acked-by: Linus Walleij <linus.walleij@linaro.org> Link: https://patchwork.freedesktop.org/patch/msgid/20210914132020.v5.9.I77d7a48df0a6585ef2cc2ff140fbe8f236a9a9f7@changeid
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