Add feature flag for phrase -> strict fallback

Bug: 281970875
Test: N/A
Change-Id: I83552b6a37c9ec67cfee1ad33a33092155c1bf80
diff --git a/AconfigFlags.bp b/AconfigFlags.bp
index fd92979b..c06459f 100644
--- a/AconfigFlags.bp
+++ b/AconfigFlags.bp
@@ -67,6 +67,11 @@
     defaults: ["framework-minus-apex-aconfig-java-defaults"],
 }
 
+cc_aconfig_library {
+    name: "aconfig_text_flags_c_lib",
+    aconfig_declarations: "com.android.text.flags-aconfig",
+}
+
 // Security
 aconfig_declarations {
     name: "android.security.flags-aconfig",