[NETD-TC#11] Make TrafficController as libtraffic_controller into am: a9716ffcb8 am: 6c606d2771 am: 68c19f7ce2

Original change: https://android-review.googlesource.com/c/platform/packages/modules/Connectivity/+/1945136

Change-Id: Ieb847ad14b61291ce821c7c07521ae89f6187a3b