Install empty device matrix when missing.

Test: build with target that does not have DEVICE_MATRIX_FILE defined

Bug: 67974785
Change-Id: I61077b6a3699bd028c92c4e60d24a499bec725ad
diff --git a/vintfdata/device_compatibility_matrix.default.xml b/vintfdata/device_compatibility_matrix.default.xml
new file mode 100644
index 0000000..eaa513e
--- /dev/null
+++ b/vintfdata/device_compatibility_matrix.default.xml
@@ -0,0 +1,10 @@
+<compatibility-matrix version="1.0" type="device">
+    <hal format="hidl" optional="false">
+        <name>android.hidl.manager</name>
+        <version>1.0</version>
+        <interface>
+            <name>IServiceManager</name>
+            <instance>default</instance>
+        </interface>
+    </hal>
+</compatibility-matrix>