use the newc archive format as requested by initramfs

This is a documentation followup to 2e591bbc0d563e12f5a260fbbca0df7d5810910e

Signed-off-by: Uwe Kleine-König <Uwe.Kleine-Koenig@digi.com>
Signed-off-by: Adrian Bunk <bunk@kernel.org>
1 file changed