Don't limit VHAL instances to just default.

This breaks configurable VHAL instance names (ag/9679700).

Bug: 184056488
Test: build and flash with ProtoCAN enabled
Change-Id: I463bfeb951bb4242dae5fc7f8cc8a8116c4f3570
diff --git a/compatibility_matrices/compatibility_matrix.current.xml b/compatibility_matrices/compatibility_matrix.current.xml
index bb53654..d59c6c5 100644
--- a/compatibility_matrices/compatibility_matrix.current.xml
+++ b/compatibility_matrices/compatibility_matrix.current.xml
@@ -90,7 +90,7 @@
         <version>2.0</version>
         <interface>
             <name>IVehicle</name>
-            <instance>default</instance>
+            <regex-instance>.*</regex-instance>
         </interface>
     </hal>
     <hal format="hidl" optional="true">