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Add greyscale Y8 format. The 8-bit greyscale format has been discussed before, and the earlier guidance was to use DRM_FORMAT_R8, as a single-channel 8-bit pixel. However, adding DRM_FORMAT_Y8 makes sense, we can mark it as 'is_yuv' in the drm_format_info, and this can help the drivers handle e.g. full/limited range. This will distinguish two single-channel formats: R8, which is a RGB format with the same value for all components, and Y8, which is a Y-only YCbCr format, with Cb and Cr being neutral. Acked-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org> Reviewed-by: Pekka Paalanen <pekka.paalanen@collabora.com> Reviewed-by: Vishal Sagar <vishal.sagar@amd.com> Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Acked-by: Simon Ser <contact@emersion.fr> Link: https://patch.msgid.link/20260423-xilinx-formats-v10-3-c690c2b8ea89@ideasonboard.com Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ideasonboard.com>