MIPS: kexec: Make a framework for both jumping and halting on nonboot CPUs

The existing implementation lets machine_kexec() CPU jump to reboot code
buffer, whereas other CPUs to relocated_kexec_smp_wait. The natural way to
bring up an SMP new kernel would be to let CPU0 do it while others being
halted. For those failing to do so, fall back to the jumping method.

Signed-off-by: Dengcheng Zhu <[email protected]>
[[email protected]: Guard kexec_nonboot_cpu_jump with CONFIG_SMP]
Signed-off-by: Paul Burton <[email protected]>
Patchwork: https://patchwork.linux-mips.org/patch/20570/
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]

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