Support nested types in NdkFullClassName()

NdkFullClassName() is used in NDK backend to get a C++ type for
AidlDefinedType. Previously, it didn't care about nested types. Now it
returns ::aidl::my::pkg::ParentType::MyType.

Bug: 201730188
Test: aidl_unittests
Change-Id: Ib13389248152b3f9afa6f60d3702721a35d9954d
1 file changed