brcm80211: fmac: store brcmf_if in net device private data

Make a proper use of private data area of net device by storing
interface related data structure instead of generic driver data
Reported-by: Johannes Berg <johannes@sipsolutions.net>
Reviewed-by: Roland Vossen <rvossen@broadcom.com>
Reviewed-by: Arend van Spriel <arend@broadcom.com>
Signed-off-by: Franky (Zhenhui) Lin <frankyl@broadcom.com>
Signed-off-by: Arend van Spriel <arend@broadcom.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

drivers/net/wireless/brcm80211/brcmfmac/dhd.h

@@ -123,7 +123,6 @@
 /* For supporting multiple interfaces */
 #define BRCMF_MAX_IFS	16
 #define BRCMF_DEL_IF	-0xe
-#define BRCMF_BAD_IF	-0xf
 
 #define DOT11_BSSTYPE_ANY			2
 #define DOT11_MAX_DEFAULT_KEYS	4