Allow using reserved package IDs

Pre-O, the platform treats negative resource IDs [those with
a package ID of 0x80 or higher] as invalid.  In order to work
around this limitation, we allow the use of traditionally
reserved resource IDs [those between 0x02 and 0x7E].

Bug: 78041707
Test: ./out/host/linux-x86/nativetest64/aapt2_tests/aapt2_tests
Test: ./out/host/linux-x86/nativetest/libandroidfw_tests/libandroidfw_tests
Test: Manual. Create a feature split with a package ID of 0x7E and see it runs and can reference base resources.

Change-Id: I3d9782cc05d3a55e1a2467bf39566788847e1160
diff --git a/tools/aapt2/ResourceValues.h b/tools/aapt2/ResourceValues.h
index 6371c4c..168ad61 100644
--- a/tools/aapt2/ResourceValues.h
+++ b/tools/aapt2/ResourceValues.h
@@ -157,6 +157,7 @@
   Maybe<ResourceId> id;
   Reference::Type reference_type;
   bool private_reference = false;
+  bool is_dynamic = false;
 
   Reference();
   explicit Reference(const ResourceNameRef& n, Type type = Type::kResource);