tf700t: init: enable low power mode

* Disabled no_lp, as it was causing the lower frequencies to not be used.
  I'm assuming this was done to combat the slow I/O on the device. Since
  ROW has been implemented, this shouldn't be much of an issue anymore.
  This is also following grouper's setting for no_lp.

Change-Id: I6ebe39417cd29b0b3107f3b547eccd3121295100