staging: wilc1000: remove typedef from tenuConnDisconnEvent

This patch removes typedef from the enum tenuConnDisconnEvent and
renames it to conn_event.

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>