drm/msm/dpu: add writeback blocks to the sm8250 DPU catalog

Add writeback blocks to the sm8250 DPU hardware catalog. Other
chipsets support writeback too but add it to sm8250 to prototype
the feature so that it can be easily extended to other chipsets.

changes in v4:
	- fix the copyright year order

Signed-off-by: Abhinav Kumar <quic_abhinavk@quicinc.com>
Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Patchwork: https://patchwork.freedesktop.org/patch/483510/
Link: https://lore.kernel.org/r/1650984096-9964-4-git-send-email-quic_abhinavk@quicinc.com


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