ResXMLTree: Clone DynamicRefTable on creation

XmlBlocks are cached in ResourcesImpl::loadXmlResourceParser(...) and
when asset manager invalidates itself, the references to the dynamic
reference tables point to garbage. Now, the reference table is cloned
when the XmlBlock is created so invalidation will not affect the
XmlTree.

Bug: 74240254
Test: Tested GoogleMaps on 9.75.7 and saw crashes stop
Change-Id: I932db7a85fddc640c4d6ec327f534b5a1ad6d0b1