drm/rcar-du: Split VGA encoder and connector

This prepares for the encoders rework.

Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>

diff --cc drivers/gpu/drm/rcar-du/Makefile
Simple merge

diff --cc drivers/gpu/drm/rcar-du/rcar_du_vga.c
Simple merge

diff --cc drivers/gpu/drm/rcar-du/rcar_du_vga.h
Simple merge

diff --cc drivers/gpu/drm/rcar-du/rcar_du_vgacon.c
Simple merge

diff --cc drivers/gpu/drm/rcar-du/rcar_du_vgacon.h
Simple merge