omni: Update to ap4a release configs

Change-Id: I61a01cfbe35676364a19e6d9e7de193b43ea5868
diff --git a/release/build_config/ap3a.textproto b/release/build_config/ap3a.textproto
deleted file mode 100644
index 11daabc..0000000
--- a/release/build_config/ap3a.textproto
+++ /dev/null
@@ -1,6 +0,0 @@
-values: [
-    {
-        name: "RELEASE_ACONFIG_VALUE_SETS"
-        value: "aconfig_value_set-omnirom-ap3a"
-    }
-]
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"
+    }
+]