xtensa: run simulator in turbo mode
xtensa: run simulator in turbo mode

This greatly increases the speed in which test cases are evaluated
on the Xtensa simulator.

The cycle limit parameter was removed, we don't currently need it
since sanitycheck handles killing test cases if they time out.

Signed-off-by: Andrew Boie <aab045b28152628be6af0e556050d0381fd0a34d@intel.com>

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