Add implementation of mtk_dsi_encoder_index to mtk_ddp_comp_func
to make mtk_dsi support dynamic connector selection.
Signed-off-by: Jason-JH.Lin <jason-jh.lin@xxxxxxxxxxxx>
Reviewed-by: CK Hu <ck.hu@xxxxxxxxxxxx>
Reviewed-by: Fei Shao <fshao@xxxxxxxxxxxx>
Tested-by: Fei Shao <fshao@xxxxxxxxxxxx>