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

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

Leaving the power save whitelists as is for now. These will be handled
in a follow-up cl.

Bug: 161896447
Test: atest ./hostsidetests/net/src/com/android/cts/net/HostsideRestrictBackgroundNetworkTests.java
Test: atest ./services/tests/servicestests/src/com/android/server/net/NetworkPolicyManagerServiceTest.java
Change-Id: I5059d8362a02a7b4622c71fdf15297af87c5a3dd