arm64: mvebu: Add bubt command for flash image burn

Add support for mvebu bubt command for flash image
load, check and burn on boot device.

Signed-off-by: Konstantin Porotchkin <kostap@marvell.com>
Reviewed-by: Stefan Roese <sr@denx.de>
Cc: Stefan Roese <sr@denx.de>
Cc: Nadav Haklai <nadavh@marvell.com>
Cc: Neta Zur Hershkovits <neta@marvell.com>
Cc: Omri Itach <omrii@marvell.com>
Cc: Igal Liberman <igall@marvell.com>
Cc: Haim Boot <hayim@marvell.com>
Cc: Hanna Hawa <hannah@marvell.com>
Signed-off-by: Stefan Roese <sr@denx.de>
diff --git a/cmd/Kconfig b/cmd/Kconfig
index 586a645..bffa713 100644
--- a/cmd/Kconfig
+++ b/cmd/Kconfig
@@ -653,6 +653,9 @@
 	  This provides access to the QEMU firmware interface.  The main
 	  feature is to allow easy loading of files passed to qemu-system
 	  via -kernel / -initrd
+
+source "cmd/mvebu/Kconfig"
+
 endmenu
 
 config CMD_BOOTSTAGE