Staging: agnx: mac80211 hw config change flags

Adapt agnx after commit "mac80211: introduce hw config change flags",
detected by following build warning:
drivers/staging/agnx/pci.c:426: warning: initialization from incompatible pointer type

Signed-off-by: Herton Ronaldo Krzesinski <herton@mandriva.com.br>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>