sms: Move the sms_from_text to gsm_04_11

Move the SMS from text code from the VTY interface into the
gsm_04_11.c code next to the sms_alloc and sms_free.
diff --git a/openbsc/src/gsm_04_11.c b/openbsc/src/gsm_04_11.c
index fc9b086..a7c6f66 100644
--- a/openbsc/src/gsm_04_11.c
+++ b/openbsc/src/gsm_04_11.c
@@ -117,6 +117,31 @@
 	talloc_free(sms);
 }
 
+struct gsm_sms *sms_from_text(struct gsm_subscriber *receiver, const char *text)
+{
+	struct gsm_sms *sms = sms_alloc();
+
+	if (!sms)
+		return NULL;
+
+	sms->receiver = subscr_get(receiver);
+	strncpy(sms->text, text, sizeof(sms->text)-1);
+
+	/* FIXME: don't use ID 1 static */
+	sms->sender = subscr_get_by_id(receiver->net, 1);
+	sms->reply_path_req = 0;
+	sms->status_rep_req = 0;
+	sms->ud_hdr_ind = 0;
+	sms->protocol_id = 0; /* implicit */
+	sms->data_coding_scheme = 0; /* default 7bit */
+	strncpy(sms->dest_addr, receiver->extension, sizeof(sms->dest_addr)-1);
+	/* Generate user_data */
+	sms->user_data_len = gsm_7bit_encode(sms->user_data, sms->text);
+
+	return sms;
+}
+
+
 static void send_signal(int sig_no,
 			struct gsm_trans *trans,
 			struct gsm_sms *sms,