dev.c includes linux/fs.h which includes linux/types.h, which defines
these types, __be16 etc. These are also defined in sparse.h, but I don't
think these are needed.
Definitions in linux/types.h includes stuff to set attr(bitwise) if
__CHECKER__ is defined, so we can remove __sp_biwise.
Signed-off-by: Andy Grover <agrover@versity.com>