sparc: fix up arch_cpu_finalize_init() build breakage.

In commit 39f0e159 ("sparc/cpu: Switch to arch_cpu_finalize_init()") the
check for ARCH_HAS_CPU_FINALIZE_INIT was backported incorrectly to the SPARC
config option, not SPARC32.  This causes build problems for the sparc64 arch:

	sparc64-linux-ld: init/main.o: in function `start_kernel':
	main.c:(.init.text+0x77c): undefined reference to `arch_cpu_finalize_init'

Fix this up by putting the option in the correct place.

Reported-by: Guenter Roeck <linux@roeck-us.net>
Link: https://lore.kernel.org/r/252c7673-53ee-4c4b-e5ef-5bb2c0416154@roeck-us.net


Fixes: 39f0e159 ("sparc/cpu: Switch to arch_cpu_finalize_init()")
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>