Update SimPhonebookProvider for UCS-2 name encoding

This eliminates the need to check for unsupported characters and hence
name validation now only checks the encoded length.

Test: atest TeleServiceTests:SimPhonebookProviderTest
Bug: 154363919

Change-Id: Ifdc85751d1991e44da2e947ad5de8878ecc57ea2
2 files changed