DO NOT MERGE disable V matrix.

Disable 9.xml on the Android 14 branch because
it should not know about the new HALs.

The 9.xml file itself is kept to avoid future
merge conflicts.

Bug: 277379745
Test: TH

Change-Id: I32263830e69080eece47dcc0880be32be02e2a9c
diff --git a/compatibility_matrices/compatibility_matrix.9.xml b/compatibility_matrices/compatibility_matrix.9.xml
index 4c24acd..188746d 100644
--- a/compatibility_matrices/compatibility_matrix.9.xml
+++ b/compatibility_matrices/compatibility_matrix.9.xml
@@ -1,3 +1,4 @@
+<!-- WARNING: This file is unused in the Android 14 branch. -->
 <compatibility-matrix version="1.0" type="framework" level="9">
     <hal format="hidl" optional="true">
         <name>android.hardware.audio</name>