image_types: make tar images more reproducible

image_types: make tar images more reproducible

Use tar-native from our build system. GNU tar changed its behaviour
starting with version 1.35. It no longer stores device numbers for
regular, non-device files. Since some supported host distributions
still use 1.34, rely on tar-native for consistency.

Strip atime and ctime from tar archives, they're not necessary and
can change from invocation to invocation. Eliminate them from the
tar output as suggested in the tar 1.35 documentation[1].

[1] https://www.gnu.org/software/tar/manual/html_node/Reproducibility.html

Signed-off-by: Dan McGregor <dan.mcgregor@usask.ca>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>