Add L2CAP signaling headers and more ACL data to btsnooz

Increase the BTSNOOZ log buffer to 256kb and adds complete L2CAP
signaling headers as well as more data per ACL data packet. This will
allow additional RFCOMM debugging.

Fixes: 28845518
Change-Id: I19e1a4a40bb1c8d332a25283fb50635d791bc275