msm: ipa3: fix prod drain for WDI 2.0

Drain WLAN_PROD pipe by sending a QMI to modem only in case
that the pipe is not empty. Also for SSR case, set a timeout
for QMI message response.

Change-Id: Iecd63a929b622d80ad4d4ebf15e8de9251f7d9d3
CRs-Fixed: 1113156
Acked-by: Ady Abraham <adya@qti.qualcomm.com>
Signed-off-by: Skylar Chang <chiaweic@codeaurora.org>