upl: Add basic tests

Add some unit tests to check that we can write a UPL handoff and read it
back.

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/test/cmd_ut.c b/test/cmd_ut.c
index 4e4aa8f..38ba89e 100644
--- a/test/cmd_ut.c
+++ b/test/cmd_ut.c
@@ -133,6 +133,9 @@
 #ifdef CONFIG_CMD_SEAMA
 	U_BOOT_CMD_MKENT(seama, CONFIG_SYS_MAXARGS, 1, do_ut_seama, "", ""),
 #endif
+#ifdef CONFIG_CMD_UPL
+	U_BOOT_CMD_MKENT(upl, CONFIG_SYS_MAXARGS, 1, do_ut_upl, "", ""),
+#endif
 };
 
 static int do_ut_all(struct cmd_tbl *cmdtp, int flag, int argc,