fix: verification of const/var decls

missing cases of AidlConstantValue::Type caused crashes when verifying
const decls of AidlDefinedTypes.

Now we verify all types of const/var decls.

Bug: 175478675
Test: aidl_unittests
Change-Id: I6524032c227f6c40b895d80c0ab172a978081390
2 files changed