staging: rtl8712: Remove unused CamelCase define

* Remove unused CamelCase in order to get rid of the corresponding
  checkpatch.pl "CHECK: Avoid CamelCase: <IEEE80211_QoS_DATAGRP>"

Signed-off-by: Michael Hornung <mhornung.linux@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/rtl8712/ieee80211.h

@@ -248,7 +248,6 @@ enum eap_type {
 #define IEEE80211_STYPE_CFPOLL		0x0060
 #define IEEE80211_STYPE_CFACKPOLL	0x0070
 #define IEEE80211_QOS_DATAGRP		0x0080
-#define IEEE80211_QoS_DATAGRP		IEEE80211_QOS_DATAGRP
 
 #define IEEE80211_SCTL_FRAG		0x000F
 #define IEEE80211_SCTL_SEQ		0xFFF0