audio: add get main underrun API [1/1]

PD#SWPL-195983

Problem:
add get main underrun API.

Solution:
add get main underrun API.

Verify:
yocto-ap222

Change-Id: Ia81ee48584b566488363dcfd273de77313b85420
Signed-off-by: yayun.shi <yayun.shi@amlogic.com>
4 files changed