libandroidfw: move ConfigDescription from aapt2 to libandroidfw

This is to allow idmap2 to access ConfigDescription.

Test: libandroidfw_tests
Test: aapt2_tests
Change-Id: I54210bbbd8dad5903cb7100807df977efa394ad5
diff --git a/tools/aapt2/test/Builders.cpp b/tools/aapt2/test/Builders.cpp
index c4eab12..f33ae31 100644
--- a/tools/aapt2/test/Builders.cpp
+++ b/tools/aapt2/test/Builders.cpp
@@ -28,6 +28,7 @@
 using ::aapt::configuration::ConfiguredArtifact;
 using ::aapt::configuration::GetOrCreateGroup;
 using ::aapt::io::StringInputStream;
+using ::android::ConfigDescription;
 using ::android::StringPiece;
 
 namespace aapt {