[ril] Remove incorrect hardcoded tech value. JB#55388

HFP spec 1.7.1 (4.34.1) says:

The Codec ID for the mandatory narrow band codec (CVSD) shall
always be included.

If wide band speech is supported, then the mandatory codec (mSBC)
shall be included unless it is temporarily unavailable.

Any other optional wide band speech codecs may also be included
in this list as long as the mandatory codec is included first.

---

The wording in spec is slightly vague on what the ordering of
mandatory narrow band codec (CVSD) and - IF wide band speech
is supported - mandatory wide band coded (mSBC) should be.
oFono's take is that the mandatory narrow band codec should
be listed first, and when mSBC is there oFono will abort the
connection.

To fix this we can be less pedantic about the ordering of
codecs - as long as the mandatory ones are there.

ofono/drivers/ril/ril_data.c

@@ -960,12 +960,6 @@ static gboolean ril_data_call_setup_submit(struct ril_data_request *req)
 			RADIO_TECH_LTE : priv->network->data.ril_tech;
 	if (tech > 2) {
 		tech += 2;
-	} else {
-		/*
-		 * This value used to be hardcoded, let's keep using it
-		 * as the default.
-		 */
-		tech = RADIO_TECH_HSPA;
 	}
 
 	if (setup->username && setup->username[0]) {

ofono/src/emulator.c

@@ -994,18 +994,17 @@ static void bac_cb(GAtServer *server, GAtServerRequestType type,
 		/*
 		 * CVSD codec is mandatory and must come first.
 		 * See HFP v1.6 4.34.1
+		 * However, some headsets send the list in wrong order,
+		 * but function fine otherwise, so to get those working
+		 * let's not be pedantic about the codec order.
 		 */
-		if (g_at_result_iter_next_number(&iter, &val) == FALSE ||
-				val != HFP_CODEC_CVSD)
-			goto fail;
-
-		em->bac_received = TRUE;
-
-		em->negotiated_codec = 0;
-		em->r_codecs[CVSD_OFFSET].supported = TRUE;
-
 		while (g_at_result_iter_next_number(&iter, &val)) {
 			switch (val) {
+			case HFP_CODEC_CVSD:
+				em->bac_received = TRUE;
+				em->negotiated_codec = 0;
+				em->r_codecs[CVSD_OFFSET].supported = TRUE;
+				break;
 			case HFP_CODEC_MSBC:
 				em->r_codecs[MSBC_OFFSET].supported = TRUE;
 				break;
@@ -1015,6 +1014,11 @@ static void bac_cb(GAtServer *server, GAtServerRequestType type,
 			}
 		}
 
+		if (!em->bac_received) {
+			DBG("Mandatory codec %d not received.", HFP_CODEC_CVSD);
+			goto fail;
+		}
+
 		g_at_server_send_final(server, G_AT_SERVER_RESULT_OK);
 
 		/*