msm: ipa: Set hard byte limit for coalescing pipe only

Change the set_aggr_limit to only set the hard byte limit for
coalescing pipe instead for every pipe in devices with IPA
HW version > 4.5 (support coalescing). Remove the warn on
for the hard byte limit in the 4.5 construct_aggr function.

Change-Id: I6e7b5cc7a58d09898060ba7fe94a88a8a51aa628
Signed-off-by: Michael Adisumarta <madisuma@codeaurora.org>