drm/msm/dpu: deduplicate some (most) of SSPP sub-blocks

As we have dropped the variadic parts of SSPP sub-blocks declarations,
deduplicate them now, reducing memory cruft.

Reviewed-by: Abhinav Kumar <quic_abhinavk@quicinc.com>
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Patchwork: https://patchwork.freedesktop.org/patch/570112/
Link: https://lore.kernel.org/r/20231201234234.2065610-7-dmitry.baryshkov@linaro.org