msm: sdio: Change the rx threshold after sleep according to read avail

This fix is required to prevent a latency in ping over
streaming channels in cases where the apps wakes up the modem.
If we restore the old threshold on the wakeup procedure,
the response to the ping is delayed until sdio_al timer
expires.

CRs-fixed: 294068
Signed-off-by: Maya Erez <merez@codeaurora.org>