On mgcoge3ne we also want to start the test application if the testpin is asserted. But we don't have a full POST test support yet. So simply add a function to read the testpin value. Signed-off-by: Holger Brunck <holger.brunck@keymile.com> Signed-off-by: Valentin Longchamp <valentin.longchamp@keymile.com>