Had the exact same issue! (https://devtalk.nvidia.com/default/topic/973760/issues-compiling-dtbs/#5009039)
From reading dmesg the kernel loads tegra210-jetson-tx1-p2597-2180-a01-devkit.dtb, so you don’t need to worry about any blobs except for that one. I just deleted all the other blobs from /boot/ and only use the one.
The reason you get that error is tegra210-p4573-2180 has a /delete-nodes/ instruction that removes your label.
I’m wrestling with the device tree too, let me know if you get everything working!