Add support for SMS-PP data download to USIM.

Devices supporting IMS may receive SMS-PP data download messages
which are normally handled in the radio baseband. Add support to
framework for these messages, passing the data to the UICC and
sending the response data as part of the SMS ACK.

Change-Id: I1da76982c6f8c402f82a6f535591e614f4e0de18