drm/msm/dsi: set video mode widebus enable bit when widebus is enabled

The value returned by msm_dsi_wide_bus_enabled() doesn't match what the
driver is doing in video mode. Fix that by actually enabling widebus for
video mode.

Fixes: efcbd6f9 ("drm/msm/dsi: Enable widebus for DSI")
Signed-off-by: Jonathan Marek <jonathan@marek.ca>
Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Reviewed-by: Marijn Suijten <marijn.suijten@somainline.org>
Reviewed-by: Jessica Zhang <quic_jesszhan@quicinc.com>
Signed-off-by: Jun Nie <jun.nie@linaro.org>
Tested-by: Neil Armstrong <neil.armstrong@linaro.org> # on SM8550-QRD
Tested-by: Neil Armstrong <neil.armstrong@linaro.org> # on SM8650-QRD
Tested-by: Neil Armstrong <neil.armstrong@linaro.org> # on SM8650-HDK
Patchwork: https://patchwork.freedesktop.org/patch/596232/
Link: https://lore.kernel.org/r/20240530-msm-drm-dsc-dsi-video-upstream-4-v6-4-2ab1d334c657@linaro.org


Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>