[automerger] Add packet length checks in l2cble_process_sig_cmd am: 3a0aab55 am: 497f11b0 am: 98366e0b skipped: d5ef3c9e am: 12860b6d am: 0849546c am: 5711e0c7 am: f4df4871 Change-Id: I3889ad16fb79dc57692ce9edae27db44f6aa8839