Revert "tf700t: init: enable performance mode as default"

* This is reverted because of the changes in AutoParts which allows the saving of the performance mode across reboots.

This reverts commit a21a52cafffa80709fbeb5d68e3d8aa71df10c9b

Change-Id: Id4b0f9b0b05de56161a537e41cae7f00996ed039