LCLS: enc/dec entire parameter set instead of GCR

In 3GPP TS 48.008 the Global Call Reference IE is only used in HANDOVER
REQUEST (§3.2.1.8) and ASSIGNMENT REQUEST (§3.2.1.1) messages which
also include LCLS Config and CSC parameters. Hence, there's no point in
using GCR encode/decode functions alone.

Introduce gsm0808_dec_lcls() and gsm0808_enc_lcls() as trivial wrappers
on top of GCR enc/dec routines which are made static. Adjust tests
accordingly. Test output intentionally left unchanged.

Change-Id: Icfbb2404e1a1d500243e2071173299b557369335
diff --git a/include/osmocom/gsm/gsm0808_utils.h b/include/osmocom/gsm/gsm0808_utils.h
index 22050b5..4a2233e 100644
--- a/include/osmocom/gsm/gsm0808_utils.h
+++ b/include/osmocom/gsm/gsm0808_utils.h
@@ -84,8 +84,8 @@
 int gsm0808_dec_aoip_trasp_addr(struct sockaddr_storage *ss,
 				const uint8_t *elem, uint8_t len);
 
-uint8_t gsm0808_enc_gcr(struct msgb *msg, const struct osmo_gcr_parsed *g);
-int gsm0808_dec_gcr(struct osmo_gcr_parsed *g, const struct tlv_parsed *tp);
+uint8_t gsm0808_enc_lcls(struct msgb *msg, const struct osmo_lcls *lcls);
+int gsm0808_dec_lcls(struct osmo_lcls *lcls, const struct tlv_parsed *tp);
 
 uint8_t gsm0808_enc_speech_codec(struct msgb *msg,
 				 const struct gsm0808_speech_codec *sc);