Revert "Kernel config kexec"

This reverts commit aba85cd2a851ee601658d0a8a8878f87c1ab211c.
Revert "Implement kexec"

This reverts commit fcdd03fe2d1e17ec9d529ca7150512af5ba7b01e.
Sabermod gcc-4.9
arm-eabi-4.7