nimble/host: remove unnecessarry opcode check in ble_eatt_l2cap_event_fn

This check caused l2cap disconnection when opcode included
in received data was write command which is supported and can be used
on eatt. Also, the comment seemed irrelevant. Fixes GATT/SR/GAW/BV-01-C

nimble/host/src/ble_eatt.c

@@ -268,16 +268,6 @@ ble_eatt_l2cap_event_fn(struct ble_l2cap_event *event, void *arg)
         opcode = event->receive.sdu_rx->om_data[0];
         if (ble_att_is_response_op(opcode)) {
             ble_npl_eventq_put(ble_hs_evq_get(), &eatt->wakeup_ev);
-        } else if (!ble_att_is_request_op(opcode)) {
-            /* As per BLE 5.4 Standard, Vol. 3, Part F, section 5.3.2
-             * (ENHANCED ATT BEARER L2CAP INTEROPERABILITY REQUIREMENTS:
-             * Channel Requirements):
-             * All packets sent on this L2CAP channel shall be Attribute PDUs.
-             *
-             * Disconnect peer with invalid behavior.
-             */
-            ble_l2cap_disconnect(eatt->chan);
-            return BLE_HS_EREJECT;
         }
 
         assert (!ble_gap_conn_find(event->receive.conn_handle, &desc));