staging: ks7010: remove struct ieee802_1x_eapol_key

This commit removes ieee802_1x_eapol_key struct because
it is not being used at all. It also removes definitions
related to some fields of the removed struct.

Signed-off-by: Sergio Paracuellos <sergio.paracuellos@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>