msm: ipa4: GCI protocal channel update polling mode for dependent channels

Both coalescing and WAN consumer pipes are sharing the same event channel,
while configuring the polling or interrupt mode for GCI protocal channel
update the WAN consumer channel polling mode also.

Change-Id: Idf8fb40aba354f6eaf320303880d6cb64e9ed51a
Signed-off-by: Ashok Vuyyuru <avuyyuru@codeaurora.org>