Declare example HAL as virtual instance.

Bug: 228638448
Test: manual (see README.md)
Change-Id: I4c00b9e394eb7863416b61662528869f7e70c09d
diff --git a/compatibility_matrices/compatibility_matrix.current.xml b/compatibility_matrices/compatibility_matrix.current.xml
index e3b17f5..c49aaab 100644
--- a/compatibility_matrices/compatibility_matrix.current.xml
+++ b/compatibility_matrices/compatibility_matrix.current.xml
@@ -142,6 +142,7 @@
         <interface>
             <name>IFingerprint</name>
             <instance>default</instance>
+            <instance>virtual</instance>
         </interface>
     </hal>
     <hal format="hidl" optional="true">