Telephony: Implement parsing of CDMA Extended Display Records

-Read the byte buffer as a byte array instead of a String to prevent interpretation as UTF-8
-Modify CdmaDisplayInfoRec to handle Extended Display Info Records
-Create ExtendedDisplayItemRec class to help in parsing the record's data
-Add function asIndex() to ExtendedDisplayTag
-Make the function readItems() private
-Modify CdmaDisplayInfoRec to use a Vector instead of a Map to hold the
-ExtendedDisplayItemRecs to preserve ordering of records.
CRs-Fixed: 212135

Change-Id: Ia1d497c05cad6b77c06b716cac0164b7310bba5b