backends/tpm: Use qemu_hexdump_line() to avoid sprintf()

backends/tpm: Use qemu_hexdump_line() to avoid sprintf()

sprintf() is deprecated on Darwin since macOS 13.0 / XCode 14.1.
Using qemu_hexdump_line() both fixes the deprecation warning and
simplifies the code base.

Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Reviewed-by: Stefan Berger <stefanb@linux.ibm.com>
[rth: Keep the linebreaks every 16 bytes]
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Message-ID: <20240412073346.458116-12-richard.henderson@linaro.org>
[PMD: Rebased]