buildroot

configs/mx6sx_udoo_neo: Bump to U-Boot 2017.01

Bump to U-Boot 2017.01, which supports mx6sx_udoo_neo by default.

Remove the U-Boot patch that we used for the previous version.

Also adjust the 'fdtfile' name as it has been changed in U-Boot
mainline.

Signed-off-by: Fabio Estevam <fabio.estevam@nxp.com>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>