soc: qcom: glink: Unlock the lock under retry transmission scenario

When the transport tells the packet scheduler to retry transmission, unlock
the locks that are locked earlier. This ensures that the scheduler does
not stall during the retry attempt.

Change-Id: I5cc25c0ecd6b24e82dfa6474c81fdef67bceab13
Signed-off-by: Karthikeyan Ramasubramanian <kramasub@codeaurora.org>