build-deps: Add device-tree-compiler

Add the device-tree-compiler so that Chromebook images will be able to run mkimage properly

Signed-off-by: Steev Klimaszewski <steev@gentoo.org>
all: Don't compress the images on 32bit.

pixz seems to have issues compressing the image files on 32bit systems.
Since we will always build official images on 64bit, only set it to compress and sha1sum the compressed file on 64bit.

Signed-off-by: Steev Klimaszewski <steev@gentoo.org>
chrombook-arm-samsung: Remove the cp of dtc to the system.

Since build-deps is now fixed, remove the cp, so that we don't overwrite the packaged version.

Signed-off-by: Steev Klimaszewski <steev@gentoo.org>
README: Update the readme to explain usage.

Signed-off-by: Steev Klimaszewski (Kali Developer) <steev@kali.org>
Merge pull request #8 from steev/master

Fixes for 32bit, and chromebook images, and a bit of documentation