Remove buildPluginDescriptor dependsOn lines for util modules

• Type: Task
• Status: Closed
• Priority: Minor
• Resolution: Completed
• Affects Version/s: None
• Fix Version/s: Master
• Component/s: Dev Tools > Plugins SDK
• Labels: None
• Priority Level: Low
• Git Pull Request: https://github.com/Ithildir/liferay-portal/pull/976

The `buildPluginDescriptor.dependsOn` were required to create the maven plugin files and are no longer needed