Add a flag to delay phone account registration

Flag: com.android.internal.telephony.flags.delay_phone_account_registration
Bug: 349731543
Test: manual testing
Change-Id: I5e8fe42f6befc201364d9da1dc50f53772cadb20
diff --git a/flags/calling.aconfig b/flags/calling.aconfig
index 550340f..a5757d8 100644
--- a/flags/calling.aconfig
+++ b/flags/calling.aconfig
@@ -51,3 +51,14 @@
     }
     is_exported: true
 }
+
+# OWNER=breadley TARGET=24Q4
+flag {
+    name: "delay_phone_account_registration"
+    namespace: "telephony"
+    description: "Fix bug where telephony would try to register for PhoneAccounts when Telecom isn't ready yet"
+    bug: "349731543"
+    metadata {
+        purpose: PURPOSE_BUGFIX
+    }
+}