core: pta: stats: Explicit Public DDR stats are deprecated

Explicitly mention in Public DDR allocation stats info that these
statistics are deprecated. With this change, the information
displayed by `xtest --stats --alloc` better show why the
printed values are all 0s for this pool.

Signed-off-by: Etienne Carriere <etienne.carriere@foss.st.com>
Acked-by: Jens Wiklander <jens.wiklander@linaro.org>

core/pta/stats.c

@@ -69,6 +69,8 @@ static TEE_Result get_alloc_stats(uint32_t type, TEE_Param p[TEE_NUM_PARAMS])
 
 		case ALLOC_ID_PUBLIC_DDR:
 			EMSG("public DDR not managed by secure side anymore");
+			strlcpy(stats->desc, "Public DDR (deprecated)",
+				sizeof(stats->desc));
 			break;
 
 		case ALLOC_ID_TA_RAM: