Add triggerImsDeregistration to IRadioImsIndication

Bug: 216387835
Test: build & flash
Change-Id: I1ef313c993816ee86233cdc5f17380ed157c38ee
diff --git a/radio/aidl/vts/radio_ims_indication.cpp b/radio/aidl/vts/radio_ims_indication.cpp
index f9c872f..6f6d4f2 100644
--- a/radio/aidl/vts/radio_ims_indication.cpp
+++ b/radio/aidl/vts/radio_ims_indication.cpp
@@ -31,4 +31,8 @@
 ndk::ScopedAStatus RadioImsIndication::notifyAnbr(RadioIndicationType /*type*/,
         int /*qosSessionId*/, ImsStreamDirection /*direction*/, int /*bitsPerSecond*/) {
     return ndk::ScopedAStatus::ok();
+}
+
+ndk::ScopedAStatus RadioImsIndication::triggerImsDeregistration(RadioIndicationType /*type*/) {
+    return ndk::ScopedAStatus::ok();
 }
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