Add @Nullable annotation where necessary in Rfc822Token
Add @Nullable annotation where necessary in Rfc822Token

Change-Id: I9b3088cbdfa09a8085b525674ff2540f23d4c96e

xorware/android_frameworks_base,xorware/android_frameworks_base,xorware/android_frameworks_base,xorware/android_frameworks_base,xorware/android_frameworks_base,xorware/android_frameworks_base