[v6 1/3] drm/msm/dpu: clean up references of DPU custom bus scaling

Since the upstream interconnect bus framework has landed upstream, the existing references of custom bus scaling needs to be cleaned up. Changes in v2: - Fixed build error due to partial clean up Changes in v3: - Condense multiple lines into a single line (Sean Paul) Changes in

[v6 1/3] drm/msm/dpu: clean up references of DPU custom bus scaling

Since the upstream interconnect bus framework has landed upstream, the existing references of custom bus scaling needs to be cleaned up. Changes in v2: - Fixed build error due to partial clean up Changes in v3: - Condense multiple lines into a single line (Sean Paul) Changes in