file, scheduling: remove non-unified I/O and CPU scheduling #2455
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In f94b1bb ("Merge 'Unify CPU scheduling groups and IO priority classes' from Pavel Emelyanov"), we folded I/O scheduling control into scheduling groups. This was more than a year ago. As it was a breaking change, we introduced API_LEVEL 7 to avoid breaking users. We now make API_LEVEL 7 mandatory and remove non-unified scheduling support.