cmd: mvebu/bubt: Set correct default image name for 32-bit Armada SoCs

32-bit Armada SoCs uses u-boot binary packed in kwbimage format. Name of
the image is in CONFIG_BUILD_TARGET option. So use it as a default option
in Kconfig.

Signed-off-by: Pali Rohár <pali@kernel.org>
1 file changed