staging: ks7010: Remove unused member 'reg_net' from 'ks_wlan_private'.

'reg_net' is never used in this driver.

Signed-off-by: Quytelda Kahja <quytelda@tamalin.org&gt;x>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>