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/optimize/MultiApkGenerator.h b/tools/aapt2/optimize/MultiApkGenerator.h
index c858879..4a5a6c3d 100644
--- a/tools/aapt2/optimize/MultiApkGenerator.h
+++ b/tools/aapt2/optimize/MultiApkGenerator.h
@@ -22,6 +22,8 @@
 #include <unordered_set>
 #include <vector>
 
+#include "androidfw/ConfigDescription.h"
+
 #include "Diagnostics.h"
 #include "LoadedApk.h"
 #include "configuration/ConfigurationParser.h"
@@ -66,7 +68,7 @@
   /**
    * Adds the <screen> elements to the parent node for the provided density configuration.
    */
-  void AddScreens(const ConfigDescription& config, xml::Element* parent);
+  void AddScreens(const android::ConfigDescription& config, xml::Element* parent);
 
   LoadedApk* apk_;
   IAaptContext* context_;