Revert "Enable kexec hardboot"

This reverts commit 502b7db14c2915b1ebde5feedc4d26b72224e792.
Revert "Implement kexec hardboot"

This reverts commit 9a854af051c816faaf1a663a57399b7add624cbb.
Revert "Fix for GCC 4.8"

This reverts commit 8f43dcd96cbbf14e53701099bfc6c83b3d800563.
Revert "Fix build on gcc 4.7/4.8"

This reverts commit b670241c7c911a855182aa669cbcd1f0e67e4112.