ARM: add xz kernel compression support

[Russell King - ARM Linux]

On Thu, Feb 16, 2012 at 03:54:15PM +0100, Michael Opdenacker wrote:
> This patchset applies on Linus' tree
> 
> It adds xz support to the ARM tree. x86 already has it, so let's have it too!
> My benchmarks below show that xz is better than lzma in terms of image size
> and uncompression time.

Have you checked what's in my tree?  Have you checked patch 7001/2 ?