[automerger] Add packet length checks in l2cble_process_sig_cmd am: 3a0aab55 am: 497f11b0 am: 98366e0b skipped: d5ef3c9e am: 12860b6d am: 0849546c am: 5711e0c7 Change-Id: I529a523e300a88ebc88e37ebeb53a00cd0275872