cmd: CONFIG_CMD_BLOBLIST must depend on CONFIG_BLOBLIST

With CONFIG_CMD_BLOBLIST=y, CONFIG_BLOBLIST=n linker errors occur:

    usr/bin/ld: cmd/bloblist.o: in function `do_bloblist_list':
    cmd/bloblist.c:27:(.text.do_bloblist_list+0x6):
    undefined reference to `bloblist_show_list'

    /usr/bin/ld: cmd/bloblist.o: in function `do_bloblist_info':
    cmd/bloblist.c:19:(.text.do_bloblist_info+0x6):
    undefined reference to `bloblist_show_stats'

Fixes: 4aed22762303 ("bloblist: Add a command")
Signed-off-by: Heinrich Schuchardt <heinrich.schuchardt@canonical.com>
diff --git a/cmd/Kconfig b/cmd/Kconfig
index c182d73..b026439 100644
--- a/cmd/Kconfig
+++ b/cmd/Kconfig
@@ -741,7 +741,8 @@
 
 config CMD_BLOBLIST
 	bool "bloblist"
-	default y if BLOBLIST
+	depends on BLOBLIST
+	default y
 	help
 	  Show information about the bloblist, a collection of binary blobs
 	  held in memory that persist between SPL and U-Boot. In the case of