AAPT2: Move format related files under same directory

Test: make aapt2_tests
Change-Id: Id72cdfc12ba3add294048e60c55f2461344464bf
diff --git a/tools/aapt2/Android.bp b/tools/aapt2/Android.bp
index 7a8a4ee..ff51d51 100644
--- a/tools/aapt2/Android.bp
+++ b/tools/aapt2/Android.bp
@@ -83,9 +83,13 @@
         "configuration/ConfigurationParser.cpp",
         "filter/AbiFilter.cpp",
         "filter/ConfigFilter.cpp",
-        "flatten/Archive.cpp",
-        "flatten/TableFlattener.cpp",
-        "flatten/XmlFlattener.cpp",
+        "format/Archive.cpp",
+        "format/binary/BinaryResourceParser.cpp",
+        "format/binary/ResChunkPullParser.cpp",
+        "format/binary/TableFlattener.cpp",
+        "format/binary/XmlFlattener.cpp",
+        "format/proto/ProtoDeserialize.cpp",
+        "format/proto/ProtoSerialize.cpp",
         "io/BigBufferStreams.cpp",
         "io/File.cpp",
         "io/FileInputStream.cpp",
@@ -106,13 +110,9 @@
         "optimize/ResourceDeduper.cpp",
         "optimize/VersionCollapser.cpp",
         "process/SymbolTable.cpp",
-        "proto/ProtoDeserialize.cpp",
-        "proto/ProtoSerialize.cpp",
         "split/TableSplitter.cpp",
         "text/Unicode.cpp",
         "text/Utf8Iterator.cpp",
-        "unflatten/BinaryResourceParser.cpp",
-        "unflatten/ResChunkPullParser.cpp",
         "util/BigBuffer.cpp",
         "util/Files.cpp",
         "util/Util.cpp",