When the conference_hold_unhold_changed_to_send_message flag is true, conference’s hold and unhold operations have changed from the function call to sending a message.

Bug: 288002989
Test: atest ImsCallingTest
Test: manual test (MO call, MT call, 1st call hold unhold, conference call, conference call swap)
Test: adb shell device_config put telephony com.android.internal.telephony.flags.conference_hold_unhold_changed_to_send_message true

Change-Id: I128702c6bda657132e4acb2a3376da6d0cbe7b6e
diff --git a/Android.bp b/Android.bp
index dc35c5d..122015e 100644
--- a/Android.bp
+++ b/Android.bp
@@ -43,7 +43,8 @@
         "PlatformProperties",
         "modules-utils-os",
         "nist-sip",
-        "service-entitlement"
+        "service-entitlement",
+        "telephony_flags_core_java_lib",
     ],
 
     srcs: [