cmd: mvebu/bubt: Enable command by default

This makes updating of u-boot/firmware on Marvell boards easier.

Signed-off-by: Pali Rohár <pali@kernel.org>
diff --git a/cmd/mvebu/Kconfig b/cmd/mvebu/Kconfig
index 029f722..e83a982 100644
--- a/cmd/mvebu/Kconfig
+++ b/cmd/mvebu/Kconfig
@@ -3,6 +3,7 @@
 
 config CMD_MVEBU_BUBT
 	bool "bubt"
+	default y
 	select SHA256 if ARMADA_3700
 	select SHA512 if ARMADA_3700
 	select DOS_PARTITION if ARMADA_3700