staging: wlan-ng: renames hfa384x_authenticateStation_data to avoid camelcase

Renames the camelcased struct hfa384x_authenticateStation_data to
hfa384x_authenticate_station_data in order to fix a checkpatch warning.

Signed-off-by: Juliana Rodrigues <juliana.orod@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>