sndcp: Standarize unitdata function naming

Use sndcp_<sap>_type>_<op> so that it's easier to distinguish and
identify them.

Change-Id: Ib8825570a8f61d0a28d631f86f5244e70d3194aa
diff --git a/src/sgsn/gprs_llc.c b/src/sgsn/gprs_llc.c
index 612dbca..302e018 100644
--- a/src/sgsn/gprs_llc.c
+++ b/src/sgsn/gprs_llc.c
@@ -1030,7 +1030,7 @@
 		case GPRS_SAPI_SNDCP9:
 		case GPRS_SAPI_SNDCP11:
 			/* send LL_DATA_IND/LL_UNITDATA_IND to SNDCP */
-			rc = sndcp_llunitdata_ind(msg, lle, llhp.data, llhp.data_len);
+			rc = sndcp_ll_unitdata_ind(msg, lle, llhp.data, llhp.data_len);
 			break;
 		case GPRS_SAPI_SMS:
 			/* FIXME */