staging: wilc1000: rename tenuAuth_type of struct connect_attr

This patch renames tenuAuth_type of struct connect_attr to auth_type to
avoid CamelCase naming convention.

Signed-off-by: Leo Kim <leo.kim@atmel.com>
Signed-off-by: Tony Cho <tony.cho@atmel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>