MSIM: Send correct modemId/RAF during SET request

- During SET_RADIO_CAP_REQUEST request, send appropriate modemId
  which received as part of  GET_RADIO_CAP request
- Update the phone RAF/ModemId local cache when UNSOL_RADIO_CAP
  success event received, this is to make sure the local cache
  is in sync with the current config @ modem layer.
- During SET_RADIO_CAP_REQUEST request, send the exact RAF value
  as is which received as part of GET_RADIO_CAP request.

bug:19296282
Change-Id: I86f3983eb86032352b84902ad7eef752f3ecfe0a