nl80211: Remove the debug print from data frame processing

This is currently happening way too frequently (mac80211 monitor
interface sends TX info for every frame) and the end result makes it
difficult to read hostapd debug log if there is large amount of data
traffic.

hostapd/driver_nl80211.c

@@ -1845,7 +1845,6 @@ static void handle_frame(struct hostapd_iface *iface, u8 *buf, size_t len,
 		handle_unknown_sta(hapd, hdr->addr2);
 		break;
 	case WLAN_FC_TYPE_DATA:
-		wpa_printf(MSG_DEBUG, "DATA");
 		handle_unknown_sta(hapd, hdr->addr2);
 		break;
 	}