staging: vt6655: Replace typedef enum _CARD_OP_MODE eOPMode with enum nl80211_iftype op_mode.

Using the nl80211 header.

Using enum changes
OP_MODE_ADHOC -> NL80211_IFTYPE_ADHOC
OP_MODE_AP ->  NL80211_IFTYPE_AP
OP_MODE_INFRASTRUCTURE -> NL80211_IFTYPE_STATION
OP_MODE_UNKNOWN -> NL80211_IFTYPE_UNSPECIFIED

Signed-off-by: Malcolm Priestley <tvboxspy@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>