staging: rtl8188eu: don't duplicate ieee80211 WLAN_AUTH_* constants

linux/ieee80211.h already defines constants for authentication
algorithms.  Remove the duplicated definitions.
Signed-off-by: Jakub Sitnicki <jsitnicki@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/rtl8188eu/include/ieee80211.h

@@ -477,12 +477,6 @@ struct ieee80211_snap_hdr {
 #define WLAN_GET_SEQ_FRAG(seq) ((seq) & RTW_IEEE80211_SCTL_FRAG)
 #define WLAN_GET_SEQ_SEQ(seq)  ((seq) & RTW_IEEE80211_SCTL_SEQ)
 
-/* Authentication algorithms */
-#define WLAN_AUTH_OPEN 0
-#define WLAN_AUTH_SHARED_KEY 1
-
-#define WLAN_AUTH_CHALLENGE_LEN 128
-
 /* Non standard?  Not in <linux/ieee80211.h> */
 #define WLAN_REASON_EXPIRATION_CHK 65535