msm: ipa: Fix updating the repl_trig_thresh for LAN_CONS

Replenish trigger threshold for LAN_CONS is calculated
before updating the rx_pool_sz. This can result into
division by 0 which can make the system unstable.
Make a change to update the rx_pool_sz before updating
the replenish trigger threshold.

Change-Id: I62f6c114ce7aee571833ef05146ab75cab0fb5d2
Acked-by: Chaitanya Pratapa <cpratapa@qti.qualcomm.com>
Signed-off-by: Utkarsh Saxena <usaxena@codeaurora.org>