wifi-scripts: add option to set per-device ifname prefix

Simplifies setting ifname to a different pattern for all affected
interfaces.

Signed-off-by: Felix Fietkau <nbd@nbd.name>

package/network/config/wifi-scripts/files-ucode/usr/share/schema/wireless.wifi-device.json

@@ -396,6 +396,10 @@
 			"type": "alias",
 			"default": "assoc_sa_query_retry_timeout"
 		},
+		"ifname_prefix": {
+			"description": "Default ifname prefix for this radio",
+			"type": "string"
+		},
 		"iface_max_num_sta": {
 			"description": "Limits the maximum allowed number of associated clients",
 			"type": "number"