include GNU GCC Linaro 6.2.1 toolchain into the docker image

There are some platforms, i.e. marvell, that requires this particular
toolchain so node should suppport it.

Signed-off-by: Leonardo Sandoval <leonardo.sandoval@linaro.org>
Change-Id: Ia7db4a75fb84f563a69e366d5060713a8888d9d3
1 file changed