[automerger] Add packet length checks in l2cble_process_sig_cmd am: 3a0aab55 am: 497f11b0 am: 98366e0b skipped: d5ef3c9e am: 12860b6d am: 0849546c Change-Id: I48680fbb3425ac46b276c15675cef1f0af9cad90