gsm_08_08: correct speech codec defaults

The speech codec defaults are not correct. The defaults recommended
in 3GPP TS 28.062, Table 7.11.3.1.3-2 are limited by 3GPP TS 48.008,
Section 3.2.2.103. Some defaults are actually reserved for future
use. Also the endianess of the 16 bit values is reversed.

- correct values so that they match the specification
- transmit bytes in the correct endianess

Change-Id: I6c3a34d39a375d71c4128fd38f06629e8b98b100
diff --git a/src/gsm/gsm0808_utils.c b/src/gsm/gsm0808_utils.c
index b58a4b8..776f091 100644
--- a/src/gsm/gsm0808_utils.c
+++ b/src/gsm/gsm0808_utils.c
@@ -210,7 +210,7 @@
 	case GSM0808_SCT_FR3:
 	case GSM0808_SCT_HR3:
 	case GSM0808_SCT_HR6:
-		msgb_put_u16(msg, sc->cfg);
+		msgb_put_u16(msg, osmo_ntohs(sc->cfg));
 		break;
 	case GSM0808_SCT_FR4:
 	case GSM0808_SCT_FR5:
@@ -320,7 +320,7 @@
 	case GSM0808_SCT_HR6:
 		if (len < 2)
 			return -EINVAL;
-		sc->cfg = osmo_load16be(elem);
+		sc->cfg = osmo_load16le(elem);
 		elem += 2;
 		break;
 	default: