RIL changes for supporting generic SIM communication.

Adds the 4 new commands to RIL interface:
  - RIL_REQUEST_SIM_TRANSMIT_BASIC (AT+CSIM - TS 27.007)
  - RIL_REQUEST_SIM_OPEN_CHANNEL (AT+CCHO - TS 27.007)
  - RIL_REQUEST_SIM_CLOSE_CHANNEL (AT+CCHC - TS 27.007)
  - RIL_REQUEST_SIM_TRANSMIT_CHANNEL (AT+CGLA - TS 27.007)

Change-Id: Iee4d950d37a6097493cd945e611c914c40827215