msm: ipa3: Apply a soft-limit aggregation behavior

Set aggregation behavior to soft limit - frames close once a packet
causes the accumulated byte-count to cross the byte-limit
threshold (closed frame will contain that packet).

Change-Id: If5a71c0722a7ca5d576109509c33c3f56c79a187
Signed-off-by: Nadine Toledano <nadinet@codeaurora.org>
Signed-off-by: Amir Levy <alevy@codeaurora.org>