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This makes the "test_type" arg the very first arg. Previously, anything
that came before it couldn't be passed in from the generated test script.

eg: running `./$out/bin/run_gtest --device $DUT_IP` would have no effect
since "--device" came before the "test_type" arg (which itself was
set in the generated script).

Bug: 866062
Change-Id: I7712f11b23f78f28e9831fe506b9467db8c217e4
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1572959Reviewed-by: John Budorick <jbudorick@chromium.org>
Commit-Queue: Ben Pastene <bpastene@chromium.org>
Cr-Commit-Position: refs/heads/master@{#652208}