test: Add a simple test for bloblist

Add a unit test for the bloblist functionality and enable bloblist for
sandbox.

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/test/cmd_ut.c b/test/cmd_ut.c
index b7e01a4..56924a5 100644
--- a/test/cmd_ut.c
+++ b/test/cmd_ut.c
@@ -55,6 +55,8 @@
 #ifdef CONFIG_SANDBOX
 	U_BOOT_CMD_MKENT(compression, CONFIG_SYS_MAXARGS, 1, do_ut_compression,
 			 "", ""),
+	U_BOOT_CMD_MKENT(bloblist, CONFIG_SYS_MAXARGS, 1, do_ut_bloblist,
+			 "", ""),
 #endif
 };
 
@@ -97,6 +99,7 @@
 static char ut_help_text[] =
 	"all - execute all enabled tests\n"
 #ifdef CONFIG_SANDBOX
+	"ut bloblist - Test bloblist implementation\n"
 	"ut compression - Test compressors and bootm decompression\n"
 #endif
 #ifdef CONFIG_UT_DM