Add broadcast support on ISO dump tool

Support Broadcast stream audio data dump from hci log

Bug: 229346816
Test: python3 ./dump_le_audio.py BTSNOOP.cfa -v --header
Change-Id: Ia8e535daa8033adef37d57fc1da0c50752b81dd1
Merged-In: Ia8e535daa8033adef37d57fc1da0c50752b81dd1
(cherry picked from commit 9c3630f6)