qcacmn: Export qdf_sprint_symbol

Some targets compile QDF into a separate module. In order to support
those targets, export qdf_sprint_symbol().

Change-Id: I7ff30aac3efdb0a119d5a9d1a63dc774b496e60e
CRs-Fixed: 2039906

qdf/linux/src/qdf_trace.c

@@ -2294,3 +2294,4 @@ int qdf_sprint_symbol(char *buffer, void *addr)
 	return 1;
 }
 #endif
+EXPORT_SYMBOL(qdf_sprint_symbol);