Add <hal format="aidl">.

Test: libvintf_test
Bug: 138244384

Change-Id: If4e9646ff1107f84ea0be68283488a37795133c3
diff --git a/ManifestHal.cpp b/ManifestHal.cpp
index 9b48a6f..3a2a1c0 100644
--- a/ManifestHal.cpp
+++ b/ManifestHal.cpp
@@ -18,6 +18,7 @@
 #include <unordered_set>
 
 #include "MapValueIterator.h"
+#include "constants-private.h"
 #include "parse_string.h"
 
 namespace android {