platform_CryptohomeFio: fix fio launching error

When specify an ascii string as verify_pattern, newer fio requires ""
around it.

BUG=chromium:581761
TEST=Fails without, pass with them
Check that only these 2 tests set a pattern.

Change-Id: I7e2b6d54c537cead1aea973484cddf71a25f8971
Signed-off-by: Gwendal Grignou <gwendal@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/324117
Reviewed-by: Puthikorn Voravootivat <puthik@chromium.org>
2 files changed