msm: ipa: Fix timing issues for IPA PM test suite

Queued work scheduling can happen immediately after
triggering it, which exposed timing race condition issue.
This change fixes it.

CRs-Fxied: 2307852
Change-Id: I09e19840708772275ca64d4eeaf7ab8ef1b7df49
Signed-off-by: Ghanim Fodi <gfodi@codeaurora.org>