ARM: bcm: use const and __initconst for smp_operations

This newly added code missed the global fixup by commit 75305275
("ARM: use const and __initconst for smp_operations").  So fix it now.

Also, add missing "static" qualifier.

Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Reviewed-by: Ray Jui <rjui@broadcom.com>
Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>