ARM: l2x0: Add explicit includes for init and types

The cache-l2x0.h header uses u32 type and the __init and __iomem
attributes, so it should have explicit includes for those.

Signed-off-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20230803-dt-header-cleanups-for-soc-v2-1-d8de2cc88bff@kernel.org


Signed-off-by: Arnd Bergmann <arnd@arndb.de>