drm/msm/dpu: add cdm blocks to dpu snapshot

Now that CDM block support has been added to DPU lets also add its
entry to the DPU snapshot to help debugging.

Signed-off-by: Abhinav Kumar <quic_abhinavk@quicinc.com>
Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Patchwork: https://patchwork.freedesktop.org/patch/571835/
Link: https://lore.kernel.org/r/20231212205254.12422-16-quic_abhinavk@quicinc.com


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