Introduce aconfig flag to fix VCN crash on receiving configs

Bug: 319791612
Test: atest TelephonySubscriptionTrackerTest
Change-Id: If3309b12f43a783b0904c2fef0267639d3ec1a85
diff --git a/flags/misc.aconfig b/flags/misc.aconfig
index dff6426..e67dabe 100644
--- a/flags/misc.aconfig
+++ b/flags/misc.aconfig
@@ -70,3 +70,13 @@
     description: "Allows applications to launch Reset Mobile Network Settings page in Settings app."
     bug:"271921464"
 }
+
+flag {
+    name: "fix_crash_on_getting_config_when_phone_is_gone"
+    namespace: "telephony"
+    description: "Fix VCN crash when calling CarrierConfigManager.getConfigForSubId while phone process has gone."
+    bug:"319791612"
+    metadata {
+        purpose: PURPOSE_BUGFIX
+    }
+}