[Buildroot] initramfs doesn't need root to create an image

[Nigel Kukard <nkukard@lbsd.net>]

Attached a patch which removes the requirement on fakeroot & makedevs
and prevents files from being created in /dev instead of devices when
one builds buildroot as a non-priv user.

Initramfs doesn't require a priv user to create the image. A perl script
merges the devices.txt into the initramfs list, fixes the permissions,
fixes ownership, orders directories to be created first and spits out a
clean list.

-N
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