drm/msm/dpu: mark remaining pp data as const

drm/msm/dpu: mark remaining pp data as const

Fix several leftover _pp strutures and mark them as const, making all hw
catalog fit into the rodata section.

Reviewed-by: Konrad Dybcio <konrad.dybcio@linaro.org>
Reviewed-by: Abhinav Kumar <quic_abhinavk@quicinc.com>
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Patchwork: https://patchwork.freedesktop.org/patch/530821/
Link: https://lore.kernel.org/r/20230404130622.509628-6-dmitry.baryshkov@linaro.org
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>