drm/msm/dpu: Add CWB to msm_display_topology

drm/msm/dpu: Add CWB to msm_display_topology

Currently, the topology is calculated based on the assumption that the
user cannot request real-time and writeback simultaneously. For example,
the number of LMs and CTLs are currently based off the number of phys
encoders under the assumption there will be at least 1 LM/CTL per phys
encoder.

This will not hold true for concurrent writeback as both phys encoders
(1 real-time and 1 writeback) must be driven by 1 LM/CTL when concurrent
writeback is enabled.

To account for this, add a cwb_enabled flag and only adjust the number of
CTL/LMs needed by a given topology based on the number of phys encoders
only if CWB is not enabled.

Reviewed-by: Abhinav Kumar <quic_abhinavk@quicinc.com>
Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Signed-off-by: Jessica Zhang <quic_jesszhan@quicinc.com>
Patchwork: https://patchwork.freedesktop.org/patch/637486/
Link: https://lore.kernel.org/r/20250214-concurrent-wb-v6-4-a44c293cf422@quicinc.com
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>