[time] Allow error logs in timekeeper-integration

One of our tests verifies that timekeeper rejects a time
sample that is before backstop time. In this case, timekeeper
outputs an error log when behaving as expected.
Detection of the log was flaky, possibly because the
component teardown races with log processing.

Fixed: 74398
Multiply: timekeeper-integration

Change-Id: Ibe6ff29e5afdc392c93ff0e2f8ca23b9147cfa28
Reviewed-on: https://fuchsia-review.googlesource.com/c/fuchsia/+/515080
Fuchsia-Auto-Submit: Satsuki Ueno <satsukiu@google.com>
Reviewed-by: Jody Sankey <jsankey@google.com>
Commit-Queue: Auto-Submit <auto-submit@fuchsia-infra.iam.gserviceaccount.com>
diff --git a/src/sys/time/timekeeper_integration/BUILD.gn b/src/sys/time/timekeeper_integration/BUILD.gn
index 29f3ab4..46ea174 100644
--- a/src/sys/time/timekeeper_integration/BUILD.gn
+++ b/src/sys/time/timekeeper_integration/BUILD.gn
@@ -148,5 +148,8 @@
 
   test_specs = {
     environments = [ nuc_env ]
+    log_settings = {
+      max_severity = "ERROR"
+    }
   }
 }