[ble] BLE API improvements: add l2cap and gatt services registration (#3563)
[ble] BLE API improvements: add l2cap and gatt services registration (#3563)


librasungirl/openthread,bukepo/openthread,chshu/openthread,turon/openthread,librasungirl/openthread,turon/openthread,openthread/openthread,srickardti/openthread,librasungirl/openthread,chshu/openthread,chshu/openthread,abtink/openthread,srickardti/openthread,chshu/openthread,bukepo/openthread,librasungirl/openthread,turon/openthread,lanyuwen/openthread,abtink/openthread,abtink/openthread,jwhui/openthread,lanyuwen/openthread,jwhui/openthread,openthread/openthread,openthread/openthread,jwhui/openthread,openthread/openthread,lanyuwen/openthread,srickardti/openthread,lanyuwen/openthread,bukepo/openthread,turon/openthread,lanyuwen/openthread,chshu/openthread,jwhui/openthread,bukepo/openthread,lanyuwen/openthread,srickardti/openthread,chshu/openthread,abtink/openthread