Revert "ARM: 7098/1: kdump: copy kernel relocation code at the kexec prepare stage"

Revert "ARM: 7098/1: kdump: copy kernel relocation code at the kexec prepare stage"

This reverts commit 420c42d72b7093526c94c8e6dbd9b5a074ddc789.

Will Deacon reports:

This is causing kexec to fail.

The symptoms are that the .init.text section is not loaded as part of the
new kernel image, so when we try to do the SMP/UP fixups we hit a whole sea
of poison left there by the previous kernel.

So my guess is that machine_kexec_prepare *is* too early for preparing the
reboot_code_buffer and, unless anybody has a good reason not to, I'd like to
revert the patch causing these problems.

Reported-by: Will Deacon <will.deacon@arm.com>