Replace Telephony internal API's usage with a public API

* Created a new API in telephony/SmsMessage.java which wrapped up BT
  usage of Telephony APIs.

Bug: 140562205
Test: Manual
Change-Id: If345c236f830d06d5056f9edb60de6f0f35d135d
Merged-In: I3131befa4abe0e2548bf295f7a8f5cd6926c8cc1
1 file changed