Turning off interpolation filter selection

Turning off the interpolation filter selection based on edge
proportion. This heuristics has not been working as well as
expected and I have started a more rigorous investigation into
this. We can turn this off for now since it is unnecessarily
slowing things down.

Rebase.

Change-Id: Ic5958b2b3a35ec2d8eb73b6d81617ca8fbe07e74