Adding flag to guard isWpsCallNumber system API.

Bug: 304272356
Test: atest
Change-Id: Idd6d8c172d607bdbe71f85d21c5e2c77abc6643e
diff --git a/flags/misc.aconfig b/flags/misc.aconfig
index 2b5ab2b..87acccc 100644
--- a/flags/misc.aconfig
+++ b/flags/misc.aconfig
@@ -13,4 +13,11 @@
   namespace: "telephony"
   description: "Whether to log MMS/SMS database access info and report anomaly when getting exception."
   bug: "275225402"
+}
+
+flag {
+  name: "enable_wps_check_api_flag"
+  namespace: "telephony"
+  description: "Enable system api isWpsCallNumber. Its an utility api to check if the dialed number is for Wireless Priority Service call."
+  bug: "304272356"
 }
\ No newline at end of file