moves arm64 jump_label_init() from smp_prepare_boot_cpu() to setup_arch(),

While jump_label_init() was moved earlier in the boot process in
efd9e03facd0 ("arm64: Use static keys for CPU features"), it wasn't early
enough for early params to use it.
This moves arm64 jump_label_init() from smp_prepare_boot_cpu() to
setup_arch(), as done already on x86, in preparation from early param
usage in the init_on_alloc/free() series:
https://lkml.kernel.org/r/1561572949.5154.81.camel@lca.pw

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