Add flag for nfc card detection

Test: repo still builds
Bug: 306203494
Change-Id: I3983801865a6b8cd9aba04c24a52f9bb2b1d7577
diff --git a/core/java/android/nfc/flags.aconfig b/core/java/android/nfc/flags.aconfig
index 17e0427..0d073cc 100644
--- a/core/java/android/nfc/flags.aconfig
+++ b/core/java/android/nfc/flags.aconfig
@@ -48,3 +48,10 @@
     description: "Enable NFC Polling Loop Notifications ST shim"
     bug: "294217286"
 }
+
+flag {
+    name: "enable_tag_detection_broadcasts"
+    namespace: "nfc"
+    description: "Enable sending broadcasts to Wallet role holder when a tag enters/leaves the field."
+    bug: "306203494"
+}