Since Liferay Faces is published to Maven Central, the deployment rules do not permit <repository> or <pluginRepository> entries to appear in any of the pom.xml files.
However, as outlined in the Building Liferay Faces From Source wiki article, there are several repositories that are needed in order for Maven to be able to download all of the required dependencies.
As a convenience to the developer, this task involves adding a settings.xml file to the root directory of the liferay-faces source tree. It will be the developer's responsibility to manually copy the entries in the settings.xml file to $HOME/.m2/settings.xml
For more information, see the following articles:
1) Sonatype OSS Maven Repository Usage Guide
2) Why putting repositories in your poms is a bad idea