ubootJetsonTK1: Install some more files

tegra-uboot-flasher needs 'u-boot', 'u-boot-nodtb-tegra.bin' and
'u-boot.dtb' for its 'flash' subcommand, and 'u-boot-dtb-tegra.bin'
for its exec subcommand.

No, there's no sanity in the embedded world.