initramfs-kexecboot(-klibc)-image: provide SUMMARY and DESCRIPTION

* plus some minor editing of comments

Signed-off-by: Andrea Adami <andrea.adami@gmail.com>
kexecboot_cfg: add SUMMARY and extend DESCRIPTION

 Signed-off-by: Andrea Adami <andrea.adami@gmail.com>
kexecboot(-klibc): add SUMMARY, DESCRIPTION, HOMEPAGE

Signed-off-by: Andrea Adami <andrea.adami@gmail.com>
ubi-utils-klibc: add SUMMARY and DESCRIPTION

Signed-off-by: Andrea Adami <andrea.adami@gmail.com>
kexec-tools-klibc: add custom SUMMARY

Signed-off-by: Andrea Adami <andrea.adami@gmail.com>
linux-yocto-tiny-kexecboot: add custom SUMMARY

Signed-off-by: Andrea Adami <andrea.adami@gmail.com>
klibc(-static)-utils: add SUMMARY

Signed-off-by: Andrea Adami <andrea.adami@gmail.com>
klcc-cross: add SUMMARY

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

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