Revert "Print display id as integer"

This reverts commit f6d1778bc159441a7f818dfa30b75d7fe2abd664.

Reason for revert: <Likely culprit for b/335559633  - verifying through ABTD before revert submission. This is part of the standard investigation process, and does not mean your CL will be reverted.>

Change-Id: I7148738bb87c173c682e06cf5d99877fb888ea58
diff --git a/services/inputflinger/dispatcher/InputState.cpp b/services/inputflinger/dispatcher/InputState.cpp
index 02bc368..c2d2b7b 100644
--- a/services/inputflinger/dispatcher/InputState.cpp
+++ b/services/inputflinger/dispatcher/InputState.cpp
@@ -338,8 +338,9 @@
         // it's unlikely that those two streams would be consistent with each other. Therefore,
         // cancel the previous gesture if the display id changes.
         if (motionEntry.displayId != lastMemento.displayId) {
-            LOG(INFO) << "Canceling stream: last displayId was " << lastMemento.displayId
-                      << " and new event is " << motionEntry;
+            LOG(INFO) << "Canceling stream: last displayId was "
+                      << inputEventSourceToString(lastMemento.displayId) << " and new event is "
+                      << motionEntry;
             return true;
         }