linux3.10: update to 3.10.28.
linux3.12: update to 3.12.9.
Merge pull request #265 from Gottox/master

odroid-u2-base: make template file comply with the base package policy.
odroid-u2-base: revert a63b3987 (mkimage is needed at build time).
cubieboard2-uboot: use latest cubieboard2.fex from upstream.
uboot-mkimage: update to 2014.01.
cubieboard2-boot: switch to 2 partitions layout (boot and root).
cubieboard2-uboot: add the bootcmd file (missed in previous).
cubieboard2-uboot: miscellaneous tweaks.

- Also set 'console=tty0' to kernel cmdline arguments.
- Change cubieboard2.fex to set default storage medium to the SD card.
- Install boot.cmd to regenerate it after booting.
cubieboard2-kernel: use official sunxi kernel for cubieboard (3.4.75).
cubieboard2-uboot: switch to machid=0x10bb (0xf35 wasn't valid).
cubieboard2-base: load the sunxi-emac module for ethernet support.
cubieboard2-uboot: remove useless uEnv.txt; use boot.cmd instead and remove console=tty0.
odroid-u2-kernel: using custom config