drm/msm/dpu: remove DPU_CTL_SPLIT_DISPLAY from CTL blocks on DPU >= 5.0

drm/msm/dpu: remove DPU_CTL_SPLIT_DISPLAY from CTL blocks on DPU >= 5.0

Since DPU 5.0 CTL blocks do not require DPU_CTL_SPLIT_DISPLAY, as single
CTL is used for both interfaces. As both RM and encoder now handle
active CTLs, drop that feature bit.

Reviewed-by: Marijn Suijten <marijn.suijten@somainline.org>
Tested-by: Neil Armstrong <neil.armstrong@linaro.org> # on SM8550-QRD
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Patchwork: https://patchwork.freedesktop.org/patch/641592/
Link: https://lore.kernel.org/r/20250307-dpu-active-ctl-v3-7-5d20655f10ca@linaro.org
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@oss.qualcomm.com>