MIPS: qi_lb60: add defconfig for Ben NanoNote

Add defconfig for the Ben NanoNote handheld computer which is built
around QI_LB60 board and Ingenic JZ4740 MIPS SoC.

Signed-off-by: Apelete Seketeli <apelete@seketeli.net>
Acked-by: Lars-Peter Clausen <lars@metafoo.de>
Signed-off-by: John Crispin <blogic@openwrt.org>
Patchwork: http://patchwork.linux-mips.org/patch/6257/