soc: qcom: glink_bgcom_xprt: Fix possible nested sleep issue

Wait loop in glink_bgcom_xprt_tx_cmd can go to sleep because
of acquiring mutex lock inside loop condition. The patch
fix this with using woken_wake_function for wait.

Change-Id: Id3a9c5175098f9bb73529a766beeef7c350bc740
Signed-off-by: Hardik Arya <harya@codeaurora.org>