test: Drop the function for running mbr tests

Use the new suite-runner to run these tests instead.

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/test/cmd_ut.c b/test/cmd_ut.c
index a196702..1a69b1c 100644
--- a/test/cmd_ut.c
+++ b/test/cmd_ut.c
@@ -159,7 +159,7 @@
 #endif
 #if defined(CONFIG_SANDBOX) && defined(CONFIG_CMD_MBR) && defined(CONFIG_CMD_MMC) \
         && defined(CONFIG_MMC_SANDBOX) && defined(CONFIG_MMC_WRITE)
-	SUITE_CMD(mbr, do_ut_mbr),
+	SUITE(mbr),
 #endif
 	SUITE_CMD(mem, do_ut_mem),
 #if defined(CONFIG_SANDBOX) && defined(CONFIG_CMD_SETEXPR)