powerpc/kasan: Disable address sanitization in kexec paths

The kexec code paths involve code that necessarily run in real mode, as
CPUs are disabled and control is transferred to the new kernel. Disable
address sanitization for the kexec code and the functions called in real
mode on CPUs being disabled.

[[email protected]: combined a few work-in-progress commits of
 Daniel's and wrote the commit message.]

Signed-off-by: Daniel Axtens <[email protected]>
Signed-off-by: Paul Mackerras <[email protected]>
[mpe: Move pseries_machine_kexec() into kexec.c so setup.c can be instrumented]
Signed-off-by: Michael Ellerman <[email protected]>
Link: https://lore.kernel.org/r/YoTFSQ2TUSEaDdVC@cleo

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