Fix a Sms7BitEncodingTranslator threading issue, since translate() method can easily race when called by multiple threads.

Bug: 160733170
Test: Sanity; Telephony unit tests; hard to reproduce
Change-Id: If8347a27a79351e84060c9a35e1cc9efd468f7a0
Merged-In: If8347a27a79351e84060c9a35e1cc9efd468f7a0
(cherry picked from commit 131781145dbd7a6f65a759f932abb48aca652ace)
1 file changed