Set the "pre_enable_prev_first" as provided by commit 4fb912e5
("drm/bridge: Introduce pre_enable_prev_first to alter bridge init
order"). This should allow us to revert commit ec7981e6
("drm/msm/dsi: don't powerup at modeset time for parade-ps8640") and
commit 7d8e9a90 ("drm/msm/dsi: move DSI host powerup to modeset
time").

Cc: Dave Stevenson <dave.stevenson@raspberrypi.com>
Cc: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Cc: Abhinav Kumar <quic_abhinavk@quicinc.com>
Reviewed-by: Dave Stevenson <dave.stevenson@raspberrypi.com>
Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Signed-off-by: Douglas Anderson <dianders@chromium.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20230131141756.RFT.v2.1.I723a3761d57ea60c5dd754c144aed6c3b2ea6f5a@changeid