Implement VintfObject::CheckCompatibility.

Test: libvintf_test

Bug: 36814503 libvintf Java API
Bug: 36126928 create tests for HalManifest::checkIncompatibility

Change-Id: I1ea9b6030a068623742d23f38d287b01946f2fc8
diff --git a/CompatibilityMatrix.cpp b/CompatibilityMatrix.cpp
index ed70133..1f95ada 100644
--- a/CompatibilityMatrix.cpp
+++ b/CompatibilityMatrix.cpp
@@ -59,6 +59,10 @@
     return nullptr;
 }
 
+SchemaType CompatibilityMatrix::type() const {
+    return mType;
+}
+
 bool operator==(const CompatibilityMatrix &lft, const CompatibilityMatrix &rgt) {
     return lft.mType == rgt.mType &&
            lft.mHals == rgt.mHals &&