drm/msm/dsi: set VIDEO_COMPRESSION_MODE_CTRL_WC

Video mode DSC won't work if this field is not set correctly. Set it to fix
video mode DSC (for slice_per_pkt==1 cases at least).

Fixes: 08802f51 ("drm/msm/dsi: Add support for DSC configuration")
Signed-off-by: Jonathan Marek <jonathan@marek.ca>
Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
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
Reviewed-by: Jessica Zhang <quic_jesszhan@quicinc.com>
Patchwork: https://patchwork.freedesktop.org/patch/596234/
Link: https://lore.kernel.org/r/20240530-msm-drm-dsc-dsi-video-upstream-4-v6-5-2ab1d334c657@linaro.org


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