AIDL effect: Minimal example implementation

Add effect factory placeholder implementation.
Update android.hardware.audio.service-aidl.example to include effects.

Bug: 238913361
Test: atest VtsHalAudioEffectTargetTest

Merged-In: I88266b509a03ee336e22be460580c5b22123659e
Change-Id: I88266b509a03ee336e22be460580c5b22123659e
(cherry picked from commit 8a0ae5430f0886f11e96391d28e34606f9e815c5)
diff --git a/compatibility_matrices/compatibility_matrix.current.xml b/compatibility_matrices/compatibility_matrix.current.xml
index 7d77503..4e2a4ed 100644
--- a/compatibility_matrices/compatibility_matrix.current.xml
+++ b/compatibility_matrices/compatibility_matrix.current.xml
@@ -37,6 +37,14 @@
             <instance>default</instance>
         </interface>
     </hal>
+    <hal format="aidl" optional="false">
+        <name>android.hardware.audio.effect</name>
+        <version>1</version>
+        <interface>
+            <name>IFactory</name>
+            <instance>default</instance>
+        </interface>
+    </hal>
     <hal format="aidl" optional="true">
          <name>android.hardware.authsecret</name>
          <version>1</version>