core: Set EchoCancelingNoiseReduction to TRUE by default

According to Bluetooth HFP spec: By default, if the AG supports its
own embedded echo canceling and/or noise reduction functions, it shall
have them activated until the AT+NREC command is received. The
configuration set by the HF shall by used by the AG while the Service
Level Connection is active.

Since there isn't a command to query the current value, it is being
assumed that Echo Canceling and Noise Reduction is enabled when the
connection is established and the gateway supports this feature.

src/handsfree.c

@@ -358,6 +358,7 @@ struct ofono_handsfree *ofono_handsfree_create(struct ofono_modem *modem,
 	hf->atom = __ofono_modem_add_atom(modem,
 					OFONO_ATOM_TYPE_HANDSFREE,
 					handsfree_remove, hf);
+	hf->nrec = TRUE;
 
 	for (l = g_drivers; l; l = l->next) {
 		const struct ofono_handsfree_driver *drv = l->data;