Following up on feedback from API council, change the String type
to CharSequence in the get and set Venue friendly name API.
Bug: 179163405
Test: atest ConnectivityServiceTest CtsNetTestCasesLatestSdk:CaptivePortalDataTest
Test: atest NetworkNotificationManagerTest NetworkMonitorTest
Change-Id: Ifa3ea9aae0cabf5757791c4ae13e6f551759ed97