Add HalInterface to compatibility matrix

Test: libvintf_test
Test: vintf_object_test

Bug: 38395193
Change-Id: I6dfc21bbfb63b575558405e441f3926ff3813eb8
diff --git a/MatrixHal.cpp b/MatrixHal.cpp
index aa6f7f3..1db7f40 100644
--- a/MatrixHal.cpp
+++ b/MatrixHal.cpp
@@ -26,6 +26,8 @@
         return false;
     if (versionRanges != other.versionRanges)
         return false;
+    if (interfaces != other.interfaces)
+        return false;
     // do not compare optional
     return true;
 }