boards: frdm_k64f: Remove settings pins that don't actually exist

On the FRDM-K64F board the SoC uses the 100 pin LQFP package version of
the SoC (MK64FN1M0VLL12).  This pacakge doesn't pin out PTA28 or PTC19.
So remove setting them.

Signed-off-by: Kumar Gala <kumar.gala@linaro.org>
1 file changed