msm: ipa3: Fix to use client mapping instead of getting pipe index

In race condition scenarios not able to get client mapping from
pipe index because of its corresponding client was mapping was freed. Added changes to
use the client mapping directly.

Change-Id: I6663d15cd58f89f50f1a3bf21f00774067189aa8
Signed-off-by: Ashok Vuyyuru <avuyyuru@codeaurora.org>