ARM: versatile: fix OF node leak in CPUs prepare

Machine code is leaking OF node reference from of_find_matching_node()
in realview_smp_prepare_cpus().

Fixes: 5420b4b1 ("ARM: realview: add an DT SMP boot method")
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Acked-by: Liviu Dudau <liviu.dudau@arm.com>
Link: https://lore.kernel.org/20240826054934.10724-1-krzysztof.kozlowski@linaro.org


Signed-off-by: Linus Walleij <linus.walleij@linaro.org>