Revert "gpu:rework gpu freqs, add two more  steps (450, 400), thanks @tbalden"

This reverts commit 46984a7157a3efe0f4bc2abef125415e20cdf967.
Revert "GPU: fix OC 887,5MHz"

This reverts commit 9d8f23c94c1a662c20c56dd1c176555a16722c88.
revert GPU complete to stock
bring back init gpu oc
gpu adjustments
switch to new gpu oc implementation thanks @ktoonsez and @flar2
adjusting GPU overclock