Add the missing SPDX license header to arch/arm/mach-sunxi/platsmp.c.
Signed-off-by: Jason Wang <wangborong@cdjrlc.com>
Signed-off-by: Maxime Ripard <maxime@cerno.tech>
Link: https://lore.kernel.org/r/20210810133138.109309-1-wangborong@cdjrlc.com