linux: run all defconfigs through 'make savedefconfig'

This tidies the cubieboard and olinuxino defconfigs and converts the
cubie2, truck and mele defconfig to the savedefconfig format.

This has no functional changes, only cosmetic ones.

Signed-off-by: Koen Kooi <koen@dominion.thruhere.net>
Merge pull request #43 from koenkooi/kernel-defconfig

linux: run all defconfigs through 'make savedefconfig'