Add telephony feature flag lib

Fix: 296290011
Test: basic voice call + data browsing
Change-Id: I4e01184e2f87b75e8d1881d7da9121443d80d6a8
diff --git a/Android.bp b/Android.bp
index dc35c5d..0dab95d 100644
--- a/Android.bp
+++ b/Android.bp
@@ -43,7 +43,8 @@
         "PlatformProperties",
         "modules-utils-os",
         "nist-sip",
-        "service-entitlement"
+        "service-entitlement",
+        "telephony_flags-lib",
     ],
 
     srcs: [