/usr/src/linux-azure-headers-4.15.0-1022/scripts/dtc/libfdt/ is in linux-azure-headers-4.15.0-1022 4.15.0-1022.22~16.04.1.
This file is owned by root:root, with mode 0o755.
..
/usr/src/linux-azure-headers-4.15.0-1022/scripts/dtc/libfdt/Makefile.libfdt
/usr/src/linux-azure-headers-4.15.0-1022/scripts/dtc/libfdt/fdt.c
/usr/src/linux-azure-headers-4.15.0-1022/scripts/dtc/libfdt/fdt.h
/usr/src/linux-azure-headers-4.15.0-1022/scripts/dtc/libfdt/fdt_addresses.c
/usr/src/linux-azure-headers-4.15.0-1022/scripts/dtc/libfdt/fdt_empty_tree.c
/usr/src/linux-azure-headers-4.15.0-1022/scripts/dtc/libfdt/fdt_overlay.c
/usr/src/linux-azure-headers-4.15.0-1022/scripts/dtc/libfdt/fdt_ro.c
/usr/src/linux-azure-headers-4.15.0-1022/scripts/dtc/libfdt/fdt_rw.c
/usr/src/linux-azure-headers-4.15.0-1022/scripts/dtc/libfdt/fdt_strerror.c
/usr/src/linux-azure-headers-4.15.0-1022/scripts/dtc/libfdt/fdt_sw.c
/usr/src/linux-azure-headers-4.15.0-1022/scripts/dtc/libfdt/fdt_wip.c
/usr/src/linux-azure-headers-4.15.0-1022/scripts/dtc/libfdt/libfdt.h
/usr/src/linux-azure-headers-4.15.0-1022/scripts/dtc/libfdt/libfdt_env.h
/usr/src/linux-azure-headers-4.15.0-1022/scripts/dtc/libfdt/libfdt_internal.h