libandroidfw: move ConfigDescription from aapt2 to libandroidfw

This is to allow idmap2 to access ConfigDescription.

Test: libandroidfw_tests
Test: aapt2_tests
Change-Id: I54210bbbd8dad5903cb7100807df977efa394ad5
Merged-In: I54210bbbd8dad5903cb7100807df977efa394ad5
diff --git a/tools/aapt2/DominatorTree_test.cpp b/tools/aapt2/DominatorTree_test.cpp
index efc523f..fe4f951 100644
--- a/tools/aapt2/DominatorTree_test.cpp
+++ b/tools/aapt2/DominatorTree_test.cpp
@@ -23,6 +23,8 @@
 #include "test/Test.h"
 #include "util/Util.h"
 
+using ::android::ConfigDescription;
+
 namespace aapt {
 
 namespace {