[Buildroot] rootfs: add U-Boot image support for cpio + lots of refactoring

[Peter Korsgaard]

>>>>> "Arnout" == Arnout Vandecappelle (Essensium/Mind) <arnout at mind.be> writes:

>  This patch series is based on Spenser Gilliland's patch that adds U-Boot
> image support to the root filesystem images. It was decided at the BR
> developer meeting that this is only ever going to be useful for cpio
> images (to be used as an initramfs), so I rewrote the patch to that end.
> But then I saw lots and lots of refactoring opportunities, which in the
> end led to this 7-patch series.

>  I have only compile-tested the cpio image, Spenser can you do a runtime
> test on the Zedboard? Your defconfig should still work.

Committed series, thanks.

-- 
Bye, Peter Korsgaard