api,introspection: report list of drivers, not just one

Different ports of the same modem may get handled by different drivers. We
therefore need to provide a list of drivers (new `Modem.Drivers' property with
signature 'as') instead of just one (removed `Modem.Driver' property with
signature 's').

$ sudo mmcli -m 0 | grep drivers
           |        drivers: 'qcserial, qmi_wwan'

plugins/simtech/mm-broadband-modem-simtech.c

@@ -791,14 +791,14 @@ setup_ports (MMBroadbandModem *self)
 
 MMBroadbandModemSimtech *
 mm_broadband_modem_simtech_new (const gchar *device,
-                                const gchar *driver,
+                                const gchar **drivers,
                                 const gchar *plugin,
                                 guint16 vendor_id,
                                 guint16 product_id)
 {
     return g_object_new (MM_TYPE_BROADBAND_MODEM_SIMTECH,
                          MM_BASE_MODEM_DEVICE, device,
-                         MM_BASE_MODEM_DRIVER, driver,
+                         MM_BASE_MODEM_DRIVERS, drivers,
                          MM_BASE_MODEM_PLUGIN, plugin,
                          MM_BASE_MODEM_VENDOR_ID, vendor_id,
                          MM_BASE_MODEM_PRODUCT_ID, product_id,

plugins/simtech/mm-broadband-modem-simtech.h

@@ -41,7 +41,7 @@ struct _MMBroadbandModemSimtechClass{
 GType mm_broadband_modem_simtech_get_type (void);
 
 MMBroadbandModemSimtech *mm_broadband_modem_simtech_new (const gchar *device,
-                                                         const gchar *driver,
+                                                         const gchar **drivers,
                                                          const gchar *plugin,
                                                          guint16 vendor_id,
                                                          guint16 product_id);

plugins/simtech/mm-plugin-simtech.c

@@ -32,14 +32,14 @@ int mm_plugin_minor_version = MM_PLUGIN_MINOR_VERSION;
 static MMBaseModem *
 create_modem (MMPlugin *self,
               const gchar *sysfs_path,
-              const gchar *driver,
+              const gchar **drivers,
               guint16 vendor,
               guint16 product,
               GList *probes,
               GError **error)
 {
     return MM_BASE_MODEM (mm_broadband_modem_simtech_new (sysfs_path,
-                                                          driver,
+                                                          drivers,
                                                           mm_plugin_get_name (self),
                                                           vendor,
                                                           product));