linux-yocto-tiny-kexecboot: replace empty tasks with explicit [noexec]=1

Signed-off-by: Andrea Adami <andrea.adami@gmail.com>
klcc-cross: disable more unused tasks

Signed-off-by: Andrea Adami <andrea.adami@gmail.com>
kexecboot(-klibc): upgrade to last upstream commit

id: 0bcc14671aa2d84ec20f260582aca36bb901ccf1
Changelog:
 minor headers fixes
 fix fb offset computations
 replace AC_CONFIG_HEADER with AC_CONFIG_HEADERS

Signed-off-by: Andrea Adami <andrea.adami@gmail.com>
kexecboot: add BBCLASSEXTEND for the klibc static flavor

remove kexecboot-klibc recipe
bump PV to local 0.5.9.1
remove PR

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