wifi: wext: Remove unused declaration dev_get_wireless_info()

Commit 55682965 ("[NL80211]: add netlink interface to cfg80211")
declared but never implemented this, remove it.
Commit 11433ee4 ("[WEXT]: Move to net/wireless") rename net/core/wireless.c
to net/wireless/wext.c, then commit 3d23e349 ("wext: refactor") refactor
wext.c to wext-core.c, fix the wext comment.
Signed-off-by: Yue Haibing <yuehaibing@huawei.com>
Reviewed-by: Simon Horman <horms@kernel.org>
Link: https://lore.kernel.org/r/20230807145032.44768-1-yuehaibing@huawei.comSigned-off-by: Johannes Berg <johannes.berg@intel.com>

include/net/iw_handler.h

@@ -426,17 +426,10 @@ struct iw_public_data {
 
 /**************************** PROTOTYPES ****************************/
 /*
- * Functions part of the Wireless Extensions (defined in net/core/wireless.c).
- * Those may be called only within the kernel.
+ * Functions part of the Wireless Extensions (defined in net/wireless/wext-core.c).
+ * Those may be called by driver modules.
  */
 
-/* First : function strictly used inside the kernel */
-
-/* Handle /proc/net/wireless, called in net/code/dev.c */
-int dev_get_wireless_info(char *buffer, char **start, off_t offset, int length);
-
-/* Second : functions that may be called by driver modules */
-
 /* Send a single event to user space */
 void wireless_send_event(struct net_device *dev, unsigned int cmd,
 			 union iwreq_data *wrqu, const char *extra);