staging: wilc1000: add bss_type to remove line over 80 characters

A local bss_type variable is added to remove checkpatch warning of
line over 80 characters.

Signed-off-by: Chaehyun Lim <chaehyun.lim@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>