drm: xlnx: zynqmp_dpsub: Add connected live layer helper
Add a helper function capturing the first connected live display layer discovery logic. Signed-off-by: Anatoliy Klymenko <anatoliy.klymenko@amd.com> Reviewed-by: Tomi Valkeinen <tomi.valkainen@ideasonboard.com> Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ideasonboard.com> Link: https://patchwork.freedesktop.org/patch/msgid/20240416-dp-live-fmt-v4-3-c7f379b7168e@amd.com
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