Add support for reporting external sink delay for split a2dp usecase. Add RUN_STARTIME_RUN_AT_ABSOLUTEIME run mode to support audio sync between bt and speaker in relay and grandpa mode. Change-Id: Ie7ff48f2e47fde93c4ed9e24fab024918772be82 Signed-off-by: Nirav Khatri <quic_khatri@quicinc.com>