msm: ipa: Fix not sending QMI sync indication

If back to back SSR is triggered there is a possibility
of race condition where we try to send QMI sync indication
with a invalid handle. Make a change to validate the handle
before sending the indication.

Change-Id: If912b6676b562bd4a23c68512e9c80e6c0ac7a49
Signed-off-by: Chaitanya Pratapa <cpratapa@codeaurora.org>