Sandbox fdt genrules

go/roboleaf-busy-beavers-sandboxing

Bug: 307824623
Test: m fdt_test_tree_empty_memory_range_dtb fdt_test_tree_multiple_memory_ranges_dtb fdt_test_tree_one_memory_range_dtb
Change-Id: Id79e30957b60a27f5929698c499f788014708197