Fix default optics

* Prior cl caused an infinite loop with the defaults
* Removed linear approximation - it caused issues with
  inverse distortion

Bug: 37443861
Test: Manually ran on a few phones
Test: Wrote a program that compared the distortion and
      undistortion values with the old and new path
Change-Id: I7221679585dd7f0fe966ff11170e9d3ec74a51df