[FUI16] Expose setSubscriberId in NetworkAgentConfig as system API

The wifi (mainline module) need to set the subscriberId for specific
wifi network.

Bug: 176396812
Test: TreeHugger
Change-Id: Ib568ce0c2d1b629e1c20e7ac8d8b78579cf4825c
1 file changed
tree: 1c8d4a0cef601cf1c11f04725e250399881a38d6
  1. core/
  2. service/
  3. services/
  4. tests/
  5. OWNERS