Move TestAccessPointBuilder.

This is necessary to make it accessible to other test packages, such as
WifiSettingsUiTest.java in packages/apps/Settings.

Bug: 37558394
Test: runtest --path
packages/apps/Settings/tests/unit/src/com/android/settings/wifi/WifiSettingsUiTest.java

Change-Id: Ic1e4185639b2947433d6371e74448097d6adb962
1 file changed