those files are in jbpm-human-task-jpa -> https://github.com/droolsjbpm/jbpm/blob/master/jbpm-human-task/jbpm-human-task-jpa/src/main/resources/META-INF/Taskorm.xml
and
in jbpm-persistence-jpa: https://github.com/droolsjbpm/jbpm/blob/master/jbpm-persistence-jpa/src/main/resources/META-INF/JBPMorm.xml
Notice that both files are in the main/src/resources directory so they should be included if you have jbpm-persistence-jpa.jar and jbpm-human-task-jpa in your class path.
HTH