logd: disable flaky logd.timeout test

This test is repeatedly seen to be flaky.  Disable it until we can run
tests against a dedicated logd instance.

Bug: 155146087
Test: logd-unit-tests
Merged-In: I0cd953955f613e40d17df73f70543d7d2f0925b6
Change-Id: I0cd953955f613e40d17df73f70543d7d2f0925b6
(cherry picked from commit 25a4d708)