ThreadPoolAvailableThreads fix.

ThreadPoolAvailableThreads would fail occasionally due to slow threads.
Sometimes a thread might not arrive on time by the time of asserting.
Increased the wait time to 500ms to allow for threads to all arrive and
prevent a flake.

Bug: 270513342
Test: atest BinderLibTest#ThreadPoolAvailableThreads --iterations 1000
Change-Id: I5924a939304802ce618f52c993cb995c735ba21a
diff --git a/libs/binder/tests/binderLibTest.cpp b/libs/binder/tests/binderLibTest.cpp
index 955c650..ce15121 100644
--- a/libs/binder/tests/binderLibTest.cpp
+++ b/libs/binder/tests/binderLibTest.cpp
@@ -1370,7 +1370,7 @@
         }));
     }
 
-    data.writeInt32(100);
+    data.writeInt32(500);
     // Give a chance for all threads to be used
     EXPECT_THAT(server->transact(BINDER_LIB_TEST_UNLOCK_AFTER_MS, data, &reply), NO_ERROR);