Add chromiumos_preflight as a data_dep to telemetry tests on CrOS.

With crrev.com/c/2277078, the tool we're using to deploy chrome to
the device/VM expects some additional runtime libs. These libs are
encapsulated in the chromiumos_preflight group. So this adds them to
any telemetry-based test's isolate input data.

Bug: 1099963
Change-Id: Ie8bdad2b0aeb4f9b0848ec54869b4fcd4d7ec34b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2288491Reviewed-by: Brian Sheedy <bsheedy@chromium.org>
Commit-Queue: Ben Pastene <bpastene@chromium.org>
Cr-Commit-Position: refs/heads/master@{#786481}

tools/perf/chrome_telemetry_build/BUILD.gn

@@ -70,6 +70,7 @@ group("telemetry_chrome_test") {
 
   if (is_chromeos && cros_board != "") {
     data_deps += [
+      "//:chromiumos_preflight",
       "//chromeos:cros_chrome_deploy",
       "//chromeos:cros_test_wrapper",
     ]