Use static const in declarations where appropriate.

Signed-off-by: Joe Perches <joe@perches.com>
Link: https://lore.kernel.org/r/818bbd25924f0c733a4a39d426fd30392d4eae80.camel@perches.com


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>