drm/msm/dpu: remove pipe_qos_cfg from struct dpu_plane

drm/msm/dpu: remove pipe_qos_cfg from struct dpu_plane

The pipe_qos_cfg is used only in _dpu_plane_set_qos_ctrl(), so remove it
from the dpu_plane struct and allocate it on stack when necessary.

Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Reviewed-by: Abhinav Kumar <abhinavk@codeaurora.org>
Link: https://lore.kernel.org/r/20210930140002.308628-3-dmitry.baryshkov@linaro.org
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Signed-off-by: Rob Clark <robdclark@chromium.org>