drm/msm/dp: release the audio ops lock for failure cases

Release the audio ops lock if there is a failure during audio
info setup. This ensures that subsequent function calls can
successfully acquire the lock, and therefore prevents deadlock
from happening.

Change-Id: Id00342e1ee107b3d77276d8315cd25a211128f5e
Signed-off-by: Tatenda Chipeperekwa <tatendac@codeaurora.org>