Release tarballs waste ~131MB per architecture by including both
rootfs.itb and rootfs.squashfs, even though rootfs.itb already
contains the squashfs (itb = 4096-byte header + squashfs).
This change removes rootfs.squashfs from releases and provides two
solutions for users who need it:
1. utils/extract-squashfs.sh - Full-featured utility for extracting
squashfs from release tarballs or .itb files. Includes validation
and helpful error messages.
2. board/common/qemu/qemu.sh - Auto-extraction support. When running
in initrd mode, automatically extracts rootfs.squashfs from
rootfs.itb if missing. Zero user impact - ./qemu.sh just works!
Space savings: ~262MB per release (2 architectures × 131MB)
Fixes#858
Signed-off-by: Joachim Wiberg <troglobit@gmail.com>
