CHROMIUM: ASoC: SOF: harden the FW boot sequence for SKL+

It is recommended to attempt FW boot more than once to
harden the FW boot sequence for SKL+ platforms.

TEST=run suspend_stress_test on bobba for 2500 iterations
BUG=b:117130615

Change-Id: I63d1c2bf4191b3dd88ad59f039260a9be36a2710
Signed-off-by: Ranjani Sridharan <ranjani.sridharan@linux.intel.com>
Reviewed-on: https://chromium-review.googlesource.com/c/1366405
Reviewed-by: Curtis Malainey <cujomalainey@chromium.org>
Tested-by: Curtis Malainey <cujomalainey@chromium.org>