drm: renesas: rz-du: rzg2l_mipi_dsi: Update the comment in rzg2l_mipi_dsi_start_video()

Add missing space in the comment in rzg2l_mipi_dsi_start_video().

Reported-by: Pavel Machek <pavel@denx.de>
Closes: https://lore.kernel.org/all/ZPg7STHDn4LbLy7f@duo.ucw.cz/


Signed-off-by: Biju Das <biju.das.jz@bp.renesas.com>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Link: https://lore.kernel.org/r/20250412061258.5447-1-biju.das.jz@bp.renesas.com