test: sandbox: fix link error with do_ut_bloblist if BLOBLIST=n

Having CONFIG_OF_EMBED=y && CONFIG_BLOBLIST=n leads to the link
error:
```
ld: /tmp/ccwtRVty.ltrans28.ltrans.o:(.data.rel+0x4b0): undefined \
                                         reference to `do_ut_bloblist'
```

Fixes: 6ea5df39e8d ("test: Only enable bloblist test when supported")
Signed-off-by: Evgeny Bachinin <EABachinin@salutedevices.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
diff --git a/test/cmd_ut.c b/test/cmd_ut.c
index 195b7ea..842c2c3 100644
--- a/test/cmd_ut.c
+++ b/test/cmd_ut.c
@@ -104,8 +104,10 @@
 			 "", ""),
 #endif
 #ifdef CONFIG_SANDBOX
+#if CONFIG_IS_ENABLED(BLOBLIST)
 	U_BOOT_CMD_MKENT(bloblist, CONFIG_SYS_MAXARGS, 1, do_ut_bloblist,
 			 "", ""),
+#endif
 	U_BOOT_CMD_MKENT(bootm, CONFIG_SYS_MAXARGS, 1, do_ut_bootm, "", ""),
 #endif
 #ifdef CONFIG_CMD_ADDRMAP