arm64: dts: allwinner: Sort dtb entries in Makefile

The dtb entries for NanoPi boards in the device tree makefile somehow
ended up after the Orange Pi boards.

Move them so the list is properly sorted.

Signed-off-by: Chen-Yu Tsai <wens@csie.org>
Signed-off-by: Maxime Ripard <maxime.ripard@bootlin.com>