/usr/aarch64-linux-gnu/include/termio.h is in libc6-dev-arm64-cross 2.27-3ubuntu1cross1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 | /* Compatible <termio.h> for old `struct termio' ioctl interface.
This is obsolete; use the POSIX.1 `struct termios' interface
defined in <termios.h> instead. */
#include <termios.h>
#include <sys/ioctl.h>
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