binderUtilsHostTest: prevent flake

When the child process here takes too long to shutdown, but not 100s that the final sleep takes, this is flaking.

Change-Id: Ic9d5d9020a7abbd37824afc94106cb4b5704163c
Fixes: 383262768
Test: N/A
diff --git a/libs/binder/tests/binderUtilsHostTest.cpp b/libs/binder/tests/binderUtilsHostTest.cpp
index a62ad96..ca70b66 100644
--- a/libs/binder/tests/binderUtilsHostTest.cpp
+++ b/libs/binder/tests/binderUtilsHostTest.cpp
@@ -89,8 +89,8 @@
     }
 
     // ~CommandResult() called, child process is killed.
-    // Assert that the second sleep does not finish.
-    EXPECT_LT(millisSince(start), 6000);
+    // Assert that the last sleep does not finish.
+    EXPECT_LT(millisSince(start), 8000);
 }
 
 TEST(UtilsHost, KillWithSigKill) {