modem: remove SECRETS_CALLER_HSO_GSM; ModemManager abstracts modems for us

Fixes a bug where if GSM secrets were required, the connection would fail
because they were requested with SECRETS_CALLER_HSO_GSM, but the function
to handle retrieved secrets only expected SECRETS_CALLER_GSM.

src/modem-manager/nm-modem-gsm.c

@@ -240,7 +240,7 @@ real_act_stage1_prepare (NMDevice *device, NMDeviceStateReason *reason)
 	nm_act_request_request_connection_secrets (req,
 											   setting_name,
 											   tries ? TRUE : FALSE,
-											   SECRETS_CALLER_HSO_GSM,
+											   SECRETS_CALLER_GSM,
 											   hint1,
 											   hint2);
 	g_object_set_data (G_OBJECT (connection), GSM_SECRETS_TRIES, GUINT_TO_POINTER (++tries));

src/nm-activation-request.h

@@ -43,8 +43,7 @@ typedef enum {
 	SECRETS_CALLER_WIFI,
 	SECRETS_CALLER_GSM,
 	SECRETS_CALLER_CDMA,
-	SECRETS_CALLER_PPP,
-	SECRETS_CALLER_HSO_GSM
+	SECRETS_CALLER_PPP
 } RequestSecretsCaller;
 
 typedef struct {