arm64: kexec: arm64_relocate_new_kernel don't use x0 as temp

x0 will contain the only argument to arm64_relocate_new_kernel; don't
use it as a temp. Reassigned registers to free-up x0 so we won't need
to copy argument, and can use it at the beginning and at the end of the
function.

Signed-off-by: Pavel Tatashin <[email protected]>
Reviewed-by: James Morse <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Will Deacon <[email protected]>

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