msm: ipa4: initialize the replenish pointer for WAN consumer pipe

When coalescing pipe and WAN consumer pipe are configuring case
using the same replenish pointer as coalescing replenish pointer causing
overriding head_idx/tail_idx values for both pipes. Add changes initialize
the new replenish pointer for WAN consumer pipe.

Change-Id: I4d637ae9fd6a6d95a12bc239fbff9dea5668ff03
Signed-off-by: Ashok Vuyyuru <avuyyuru@codeaurora.org>