configs/nanopi-neo: use a more conventional kernel

It turns out that linux-4.9-rc3 has all that is needed for the NanoPi
NEO, so use that rather than the franken-kernel I assembled.

Reported-by: Maxime Ripard <maxime.ripard@free-electrons.com>
Signed-off-by: "Yann E. MORIN" <yann.morin.1998@free.fr>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>