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Convert open-coded for loops to __for_each_static_engine. That takes
care of the last direct user of intel_execution_engines2.

More work is needed to make intel_reg support dynamically queried
engines but this restores the old functionality.
Signed-off-by: Petri Latvala <petri.latvala@intel.com>
Cc: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>