kexec-tools_2.0.2.bbappend: remove, packages are now split in oe-core

* packaging split from meta-openembedded has been accepted in oe-core
* as per commit id 1f40a5486f703684c5d1d7360ef3cbdf75577495

Signed-off-by: Andrea Adami <andrea.adami@gmail.com>
Signed-off-by: Koen Kooi <koen@dominion.thruhere.net>