drm/msm/mdss: export UBWC data

DPU programming requires knowledge of some of UBWC parameters. This
results in duplication of UBWC data between MDSS and DPU drivers. Export
the required data from MDSS driver.

Reviewed-by: Abhinav Kumar <quic_abhinavk@quicinc.com>
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Patchwork: https://patchwork.freedesktop.org/patch/550052/
Link: https://lore.kernel.org/r/20230728213320.97309-4-dmitry.baryshkov@linaro.org