drm/rcar-du: Update copyright notice

The "Renesas Corporation" listed in the copyright notice doesn't exist.
Replace it with "Renesas Electronics Corporation" and update the
copyright years.

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

diff --cc drivers/gpu/drm/rcar-du/rcar_du_plane.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