sandbox: Correct ordering of 'sb save' commands

Prior to commit d455d87 there was an inconsistency between the position of
the 'address' parameter in 'sb load' and 'sb save'. This was corrected but
it broke some tests. Fix the tests and also the help for 'sb save'.

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/test/dm/sf.c b/test/dm/sf.c
index 57dd134..08098a1 100644
--- a/test/dm/sf.c
+++ b/test/dm/sf.c
@@ -29,7 +29,7 @@
 	 * benefit is worth the extra complexity.
 	 */
 	ut_asserteq(0, run_command_list(
-		"sb save hostfs - spi.bin 0 200000;"
+		"sb save hostfs - 0 spi.bin 200000;"
 		"sf probe;"
 		"sf test 0 10000", -1,  0));
 	/*