fabtests/multi_ep: Support customized transfer size

The current test hard-coded the transfer size as 256,
this patch allows the test to run with customized
transfer size

Signed-off-by: Shi Jin <sjina@amazon.com>

fabtests/functional/multi_ep.c

@@ -616,14 +616,15 @@ int main(int argc, char **argv)
 	if (!hints)
 		return EXIT_FAILURE;
 
-	while ((op = getopt_long(argc, argv, "c:vhAQ" ADDR_OPTS INFO_OPTS,
+	while ((op = getopt_long(argc, argv, "c:vhAQ" ADDR_OPTS INFO_OPTS CS_OPTS,
 				 long_opts, &lopt_idx)) != -1) {
 		switch (op) {
 		default:
 			if (!ft_parse_long_opts(op, optarg))
 				continue;
 			ft_parse_addr_opts(op, optarg, &opts);
 			ft_parseinfo(op, optarg, hints, &opts);
+			ft_parsecsopts(op, optarg, &opts);
 			break;
 		case 'c':
 			num_eps = atoi(optarg);