Remove STHAL 2.4

This version was only created as an intermediate version for
development and was never intended for release. STHAL 3 (AIDL) has
feature-parity with this one and is intended for release.

Bug: 181996624
Test: Manual verification of soundtrigger use-cases.
Change-Id: Ic490bbd0501ec593d741cf612f8fd995b7bb9c4e
diff --git a/compatibility_matrices/compatibility_matrix.current.xml b/compatibility_matrices/compatibility_matrix.current.xml
index 62067bf..f03008a 100644
--- a/compatibility_matrices/compatibility_matrix.current.xml
+++ b/compatibility_matrices/compatibility_matrix.current.xml
@@ -536,7 +536,7 @@
     </hal>
     <hal format="hidl" optional="true">
         <name>android.hardware.soundtrigger</name>
-        <version>2.3-4</version>
+        <version>2.3</version>
         <interface>
             <name>ISoundTriggerHw</name>
             <instance>default</instance>