drm/msm/dpu: remove dpu_hw_fmt_layout from struct dpu_hw_pipe_cfg

Remove dpu_hw_fmt_layout instance from struct dpu_hw_pipe_cfg, leaving
only src_rect and dst_rect. This way right and left pipes will have
separate dpu_hw_pipe_cfg isntances, while the layout is common to both
of them.

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