Revert "staging: nvec: Augment TODO file with GPIO work item"

This reverts commit 5a3e59ce, because the
necessary changes were applied in the "staging: nvec: convert to use GPIO
descriptors" patch.

Signed-off-by: Marc Dietrich <marvin24@gmx.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>