Add ISO type support on btsnooz.py script

Support to decode the ISO packet from the compressed btsnoop in
bugreport.

Bug: 150670922
Bug: 177616528
Test: btsnooz.py bugreport-*.txt which contain ISO traffic.
Tag: #feature
Change-Id: I070ec3023ed2ef65c3d1fce90dcfe2b9d695a89f