omni: Update to ap4a release configs

Change-Id: I61a01cfbe35676364a19e6d9e7de193b43ea5868
diff --git a/release/build_config/ap4a.textproto b/release/build_config/ap4a.textproto
new file mode 100644
index 0000000..aea9756
--- /dev/null
+++ b/release/build_config/ap4a.textproto
@@ -0,0 +1,6 @@
+values: [
+    {
+        name: "RELEASE_ACONFIG_VALUE_SETS"
+        value: "aconfig_value_set-omnirom-ap4a"
+    }
+]