Fix Wi-Fi SSID null handling

When Wi-Fi SSID is null in NetworkCapabilities,
get Wi-Fi SSID from connection info (WifiInfo) which is non-null design.

Bug: 176396812
Test: FrameworksNetTests NetworkPolicyManagerServiceTest
Change-Id: I59c7d8f7e176d0c6bb100721269f3f6165f0ca21
1 file changed
tree: f36f1cd0ad2fd0c623bd1f527b222049ac704d07
  1. core/
  2. services/