arm64: zynqmp: Enable booting to ATF
U-Boot is now able to boot to ARM Trusted Firmware (ATF). The boot flow is SPL(EL3) loads ATF and full u-boot and jump to ATF(EL3) which pass control to full u-boot(EL2). This has been tested on zcu106, so enable it in this defconfig. To generate an image that triggers this booting flow, you need to pass '-O arm-trusted-firmware' to mkimage. Signed-off-by: NLuca Ceresoli <luca@lucaceresoli.net> Signed-off-by: NMichal Simek <michal.simek@xilinx.com>
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