[RFC 0/6] drm/msm/dpu: add support for idependent DSI config

[Dmitry Baryshkov]

This patchseries adds support for independent DSI config to DPU1 display
subdriver. This results in ability to drop one of msm_kms_funcs
callbacks.

This code was tested on RB5 (dpu, dsi). Neither DP nor MDP5 changes were
tested (thus the RFC tag).