staging: gdm72xx depends on NET

gdm72xx uses networking interfaces, so it should depend
at least on NET (maybe on WIMAX?).

ERROR: "sock_release" [drivers/staging/gdm72xx/gdmwm.ko] undefined!
ERROR: "netif_carrier_on" [drivers/staging/gdm72xx/gdmwm.ko] undefined!
ERROR: "netif_carrier_off" [drivers/staging/gdm72xx/gdmwm.ko] undefined!
ERROR: "skb_realloc_headroom" [drivers/staging/gdm72xx/gdmwm.ko] undefined!
ERROR: "netif_rx" [drivers/staging/gdm72xx/gdmwm.ko] undefined!
ERROR: "netlink_kernel_create" [drivers/staging/gdm72xx/gdmwm.ko] undefined!
ERROR: "netif_rx_ni" [drivers/staging/gdm72xx/gdmwm.ko] undefined!
ERROR: "dev_alloc_skb" [drivers/staging/gdm72xx/gdmwm.ko] undefined!
ERROR: "free_netdev" [drivers/staging/gdm72xx/gdmwm.ko] undefined!
ERROR: "register_netdev" [drivers/staging/gdm72xx/gdmwm.ko] undefined!
ERROR: "skb_push" [drivers/staging/gdm72xx/gdmwm.ko] undefined!
ERROR: "dev_get_by_index" [drivers/staging/gdm72xx/gdmwm.ko] undefined!
ERROR: "skb_pull" [drivers/staging/gdm72xx/gdmwm.ko] undefined!
ERROR: "init_net" [drivers/staging/gdm72xx/gdmwm.ko] undefined!
ERROR: "__alloc_skb" [drivers/staging/gdm72xx/gdmwm.ko] undefined!
ERROR: "netlink_broadcast" [drivers/staging/gdm72xx/gdmwm.ko] undefined!
ERROR: "kfree_skb" [drivers/staging/gdm72xx/gdmwm.ko] undefined!
ERROR: "alloc_netdev_mqs" [drivers/staging/gdm72xx/gdmwm.ko] undefined!
ERROR: "eth_type_trans" [drivers/staging/gdm72xx/gdmwm.ko] undefined!
ERROR: "ether_setup" [drivers/staging/gdm72xx/gdmwm.ko] undefined!
ERROR: "unregister_netdev" [drivers/staging/gdm72xx/gdmwm.ko] undefined!
ERROR: "__netif_schedule" [drivers/staging/gdm72xx/gdmwm.ko] undefined!
ERROR: "skb_put" [drivers/staging/gdm72xx/gdmwm.ko] undefined!
ERROR: "sock_wfree" [drivers/staging/gdm72xx/gdmwm.ko] undefined!
ERROR: "__nlmsg_put" [drivers/staging/gdm72xx/gdmwm.ko] undefined!

Signed-off-by: Randy Dunlap <rdunlap@xenotime.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>