msm: ipa: adjust the RX replenish threshold according to IPA WM

In IPA2.6L, a HOLB mitigation mechanism has been added. Its purpose
is to monitor IPA Producer (From IPA) pipes which are running low
on descriptors below a certain WM value and stop the IPA Consumers
(To IPA) from sending more packets in order to avoid IPA to get
stalled (Until the IPA Producers replenish more descriptors).
This change takes into account the IPA WM values and sets the
threshold accordingly in the SW.

CRs-fixed: 828067
Change-Id: Idb99777dbb3d3e7f08a4695a91a78f1075637a97
Signed-off-by: Sivan Reinstein <sivanr@codeaurora.org>
Acked-by: David Arinzon <darinzon@qti.qualcomm.com>