drm/msm/dpu: Implement CTL_PIPE_ACTIVE for v12.0 DPU

drm/msm/dpu: Implement CTL_PIPE_ACTIVE for v12.0 DPU

v12.0 DPU on SM8750 comes with new CTL_PIPE_ACTIVE register for
selective activation of pipes, which replaces earlier
dpu_hw_ctl_setup_blendstage() code path for newer devices.

Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Patchwork: https://patchwork.freedesktop.org/patch/659630/
Link: https://lore.kernel.org/r/20250618-b4-sm8750-display-v7-11-a591c609743d@linaro.org
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@oss.qualcomm.com>