init-ifupdown: p2plink: allow to set persistent parameters

Use ifupdown variable 'p2p-network-id' to pass a WPA supplicant network
id, to pre-populate some parameters (SSID/passphrase) when creating the
group where this device is the GO.

Also replace go_intent=7 with the auto parameter. According to the
documentation:

    "auto" can be used to request wpa_supplicant to automatically
    figure out whether the peer device is operating as a GO and if so,
    use join-a-group operation rather than GO Negotiation.

https://jira.digi.com/browse/DEL-6741

Signed-off-by: Javier Viguera <javier.viguera@digi.com>

meta-digi-dey/recipes-core/init-ifupdown/init-ifupdown-1.0/p2plink

@@ -24,6 +24,7 @@
 #     p2p-freq <channel-freq>
 #     p2p-local-address <local-ip>
 #     p2p-local-netmask <local-netmask>
+#     p2p-network-id <wpa_supplicant_conf P2P network ID>
 #
 
 # Execute only for the p2p0 interface
@@ -54,7 +55,7 @@ if [ "${MODE}" = "start" ]; then
 
 	# Peer found, establish the link
 	log info "establish P2P link"
-	wpa_cli -i"${IFACE}" p2p_connect "${IF_P2P_PEER_MAC}" pbc go_intent=7 ${IF_P2P_FREQ:+freq=${IF_P2P_FREQ}}
+	wpa_cli -i"${IFACE}" p2p_connect "${IF_P2P_PEER_MAC}" pbc ${IF_P2P_NETWORK_ID:+persistent=${IF_P2P_NETWORK_ID}} ${IF_P2P_FREQ:+freq=${IF_P2P_FREQ}} auto
 	for _ in $(seq 20); do
 		if wpa_cli status 2>&1 | grep -qs "^wpa_state=COMPLETED$"; then
 			if wpa_cli status 2>&1 | grep -qs "^mode=P2P GO$"; then