docker: Adjust installed packages slightly

We no longer need to install libc6-i386 so we can drop that. Switch to
installing linux-image-generic as that will be available on all hosts,
to provide the /boot/vmlinu* file that's requires for various tools.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Tom Rini <trini@konsulko.com>
1 file changed