qcacld-3.0: do memory zero for pre-alloc multi-pages when free

Do each page memory zero operation for pre-alloc pages memory
when the pages memory is put back to pool.

Change-Id: I06689054ff57df2177f9d0d183494a357e4e05d6
CRs-Fixed: 2776363

core/dp/txrx3.0/dp_txrx.c

@@ -509,7 +509,8 @@ void dp_prealloc_put_multi_pages(uint32_t desc_type,
 				dp_info("i %d: desc_type %d returned",
 					i, desc_type);
 				mp->in_use = false;
-				/* is page memory zero needed? */
+				qdf_mem_multi_pages_zero(&mp->pages,
+							 mp->cacheable);
 				break;
 			}
 		}