AFAIK, map jar files are not available in any online maven repository at the moment.
Either use Android SDK Manager download the required map jar file then manually install it to you local maven repository:
mvn install:install-file -Dfile=your-artifact-1.0.jar
[-DgroupId=org.some.group]
[-DartifactId=your-artifact]
[-Dversion=1.0]
[-Dpackaging=jar]
Or use Manfred's maven-android-sdk-deployer install all Android SDK jar files to your local maven repository.
Then you can start using it in pom.xml:
<dependency>
<groupId>com.google.android.maps</groupId>
<artifactId>maps</artifactId>
<version>4_r2</version>
<scope>provided</scope>
</dependency>
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