add device-tree-compiler package to build dtb

Dockerfile

@@ -1,4 +1,4 @@
-FROM debian:jessie
+FROM debian:stable
 MAINTAINER Émile Morel
 
 # U-boot part
@@ -8,7 +8,7 @@ ENV LC_ALL C
 ENV LANGUAGE C
 ENV LANG C
 RUN apt-get update
-RUN apt-get install --force-yes -y curl ncurses-dev u-boot-tools build-essential git vim libusb-1.0-0-dev pkg-config bc netpbm wget bzip2 debootstrap dpkg-dev qemu binfmt-support qemu-user-static apt-cacher
+RUN apt-get install --force-yes -y curl ncurses-dev u-boot-tools build-essential git vim libusb-1.0-0-dev pkg-config bc netpbm wget bzip2 debootstrap dpkg-dev qemu binfmt-support qemu-user-static apt-cacher device-tree-compiler
 RUN echo deb http://emdebian.org/tools/debian/ jessie main > /etc/apt/sources.list.d/emdebian.list
 RUN curl http://emdebian.org/tools/debian/emdebian-toolchain-archive.key | apt-key add -
 RUN dpkg --add-architecture armhf