staging: wilc1000: remove unused data types

There's some "custom" data types defined that are never used in the
driver, so remove them before we work on converting the rest to be
"standard" data types.

Cc: Johnny Kim <johnny.kim@atmel.com>
Cc: Rachel Kim <rachel.kim@atmel.com>
Cc: Dean Lee <dean.lee@atmel.com>
Cc: Chris Park <chris.park@atmel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>