Add new RIL requests to support SIM data download via SMS over IMS.

Add new RIL requests to support SIM data download via SMS over IMS.

On an LTE device where incoming SMS messages over IMS are sent to
the framework via RIL_UNSOL_RESPONSE_NEW_SMS responses sent to
the RIL, it may be necessary to process USIM data download SM's
(message class 2). This requires the RIL to implement two new requests.

1) RIL_REQUEST_STK_SEND_ENVELOPE_WITH_STATUS:
   send an ENVELOPE command to the UICC, receiving the SW1 and SW2
   status bytes in addition to the command response.

2) RIL_REQUEST_SMS_ACKNOWLEDGE_WITH_PDU:
   send an RP-ACK or RP-ERROR acknowledgement to the incoming SM,
   including an acknowledgement PDU containing the envelope response.

Change-Id: Id134dd90611b147fdc8aebc8ccdf0e989a6542a9