Clarify binder RPC error message with linkToDeath

There needs to be threads for incoming connections before linking to
death so the service can get the notifications.

Test: none
Bug: none
Change-Id: I2e850de4fbb171b2b5c302c85980bb4966d73421
diff --git a/libs/binder/BpBinder.cpp b/libs/binder/BpBinder.cpp
index d03326e..53852d8 100644
--- a/libs/binder/BpBinder.cpp
+++ b/libs/binder/BpBinder.cpp
@@ -388,7 +388,8 @@
 {
     if (isRpcBinder()) {
         if (rpcSession()->getMaxIncomingThreads() < 1) {
-            ALOGE("Cannot register a DeathRecipient without any incoming connections.");
+            ALOGE("Cannot register a DeathRecipient without any incoming threads. Need to set max "
+                  "incoming threads to a value greater than 0 before calling linkToDeath.");
             return INVALID_OPERATION;
         }
     } else if constexpr (!kEnableKernelIpc) {