Update language to comply with Android’s inclusive language guidance.

See https://source.android.com/setup/contribute/respectful-code for reference

Bug: 161896447
Test: atest ./services/tests/servicestests/src/com/android/server/net/NetworkPolicyManagerServiceTest.java
Change-Id: I5059fc3322030d3bc01c5f3d2a5e2586569c4784