linux-kexecboot_3.2: update from 3.2.7 to 3.2.8

* apply latest stable patchset to match linux-yocto_3.2
* (work in progress about using linux-yocto-tiny as base for kexecboot)
* bump PR

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