Don't print error if we can't talk to hwservicemanager.

This currently fails as a non-root user due to SEPolicy,
and is causing CTS test failures. Until we figure out
the policy on b/34242478, don't print an error to allow
the test to pass again.

Test: cts-tradefed run cts --module CtsAtraceHostTestCases --test
android.atrace.cts.AtraceHostTest#testSimpleRun

Bug: 33814619
Change-Id: Ie5578639028e7890284d71bbf1b753f5803ca4af