kexecboot_cfg: fix against unwanted appendings to boot.cfg

Signed-off-by: Andrea Adami <andrea.adami@gmail.com>
linux-yocto-tiny-kexecboot: repair after changes in kernel.bbclass

Add INITRAMFS_TASK to build the cpio on first run and exclude
the packaging tasks to avoid the expected errors about modules_split
and packaging. The recipe doesn't create any package.

Signed-off-by: Andrea Adami <andrea.adami@gmail.com>
linux-yocto-tiny-kexecboot: move from 3.8 to 3.10

Signed-off-by: Andrea Adami <andrea.adami@gmail.com>
linux-yocto-tiny-kexecboot: exclude all packaging tasks

Signed-off-by: Andrea Adami <andrea.adami@gmail.com>