Dispose of TransportClient in updateStateForTransport()

Forgot this one :)

Change-Id: I13126b94ad0272c912a3e1c3d2e8ee06692a1897
Ref: http://go/br-binding-on-demand
Bug: 17140907
Test: m -j RunFrameworksServicesRoboTests
Test: adb shell bmgr transport [-c] <transport>, check connections
2 files changed