Interworking: Add GAS server support for AP mode

This adds GAS/ANQP implementation into hostapd. This commit brings in
the basic GAS/ANQP functionality, but only the ANQP Capability List
element is supported.

For testing purposes, hostapd control interface SET command can be used
to set the gas_frag_limit parameter dynamically.

Signed-hostap: Jouni Malinen <jouni@qca.qualcomm.com>

src/ap/hostapd.h

@@ -169,6 +169,9 @@ struct hostapd_data {
 	int noa_start;
 	int noa_duration;
 #endif /* CONFIG_P2P */
+#ifdef CONFIG_INTERWORKING
+	size_t gas_frag_limit;
+#endif /* CONFIG_INTERWORKING */
 };