The U-Boot configuration for Zynq boards have CONFIG_FIT_SIGNATURE=y,
so they need OpenSSL to be available on the host system. In order to
add OpenSSL to the build this commit adds the
BR2_TARGET_UBOOT_NEEDS_OPENSSL=y to the relevant defconfigs.
Fixes#9316.
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
