Revert "cpufreq: interactive: fix crash on error paths in get_tokenized_data"

This reverts commit 1067213bf386fb41f050e76d1a79378009cce3be.
Revert "cpufreq: interactive: add io_is_busy interface"

This reverts commit 75b7b89d98b24f221ba339735e1d848746226de7.
Revert "cpufreq: interactive: allow arbitrary speed / delay mappings"

This reverts commit 340340caf4242f69e884ad74d78a1c9491440724.