qcacld-3.0: Add support to convert 11AX mode to string

Currently host driver returns dot11 mode as unknown for
11AX connection to connect_info sysfs command, the reason
is that there is no converison 11AX mode to string.

To address above issue, add support to convert 11AX mode
to string and fill the correct dot11 mode for connect_info
sysfs command.

Change-Id: I57d30e5db80ea723808b57c22c7a5ebbeca55167
CRs-Fixed: 3049070

core/hdd/src/wlan_hdd_sysfs_connect_info.c

@@ -285,6 +285,9 @@ uint8_t *hdd_dot11_mode_str(uint32_t dot11mode)
 		return "DOT11 MODE AUTO";
 	case eCSR_CFG_DOT11_MODE_ABG:
 		return "DOT11 MODE 11ABG";
+	case eCSR_CFG_DOT11_MODE_11AX:
+	case eCSR_CFG_DOT11_MODE_11AX_ONLY:
+		return "DOT11_MODE_11AX";
 	}
 
 	return "UNKNOWN";