copy fewer uboot files
In order to simplify the build only copy what we actually need to invoke flash_hdmi_spl_uboot.
Tested with a u-boot-devkit-recovery.imx build to boot a kernel on the devkit.
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In order to simplify the build only copy what we actually need to invoke flash_hdmi_spl_uboot.
Tested with a u-boot-devkit-recovery.imx build to boot a kernel on the devkit.