msm: ipa4: Fix to update the polling mode for coalescing channel

When default wan consumer pipe polling mode was changed, not updating
the polling mode for coalescing pipe. As both the pipes are sharing
a common event ring because of that observing warning logs, it was
leading to watchdog bite. Add changes to update the polling mode
for coalescing channel when wan default pipe polling mode changed.

Change-Id: I8630c9866cb7925d21ff7fd9dc68fcb03a98cbc5
Signed-off-by: Ashok Vuyyuru <avuyyuru@codeaurora.org>