Add low-level-can-generator as devtool in SDK

Add low-level-can-generator as devtool in SDK

To ease devlopment with low level CAN service, you have to use
the generator to be able to customize signals handled by the service.

Change-Id: Id51415ee339a5ede77bc875aa893893f1b31dbdf
Signed-off-by: Romain Forlot <romain.forlot@iot.bzh>
Reviewed-on: https://gerrit.automotivelinux.org/gerrit/10143
Tested-by: Jenkins Job builder account <agl-jobbuilder@automotivelinux.org>
ci-image-build: Jenkins Job builder account <agl-jobbuilder@automotivelinux.org>
Reviewed-by: Jan-Simon Moeller <jsmoeller@linuxfoundation.org>