Compatibility_matrix: s/current/4/

To indicate frozen state/development shouldn't occur here.

Bug: 126892442
Test: TH (build checks compatibility matrices)
Change-Id: I3daf93d750462bf7dcb698a353801bc55a459d45
(cherry picked from commit 86eb7fc62bd138c746e20171124abaf9b975006c)
Merged-In: I3daf93d750462bf7dcb698a353801bc55a459d45
diff --git a/compatibility_matrices/Android.bp b/compatibility_matrices/Android.bp
index 5f56ee9..96b05c9 100644
--- a/compatibility_matrices/Android.bp
+++ b/compatibility_matrices/Android.bp
@@ -64,10 +64,10 @@
 }
 
 vintf_compatibility_matrix {
-    name: "framework_compatibility_matrix.current.xml",
-    stem: "compatibility_matrix.current.xml",
+    name: "framework_compatibility_matrix.4.xml",
+    stem: "compatibility_matrix.4.xml",
     srcs: [
-        "compatibility_matrix.current.xml",
+        "compatibility_matrix.4.xml",
     ],
     kernel_configs: [
         "kernel_config_current_4.9",