Revert "arm64: Initialize jump labels before setup_machine_fdt()"

This reverts commit 73e2d827.

The reverted patch was needed as a fix after commit f5bda35f
("random: use static branch for crng_ready()"). However, this was
already fixed by 60e5b288

 ("random: do not use jump labels before
they are initialized") and hence no longer necessary to initialise jump
labels before setup_machine_fdt().

Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>