Commit 5c67cb1d04 ("linux: use zImage by default on ARM") changed
the default kernel image, but missed to update Zynq defconfigs.
U-Boot on Zynq boards still loads uImage, so BR2_LINUX_KERNEL_UIMAGE
should be defined to generate uImage.
Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>