fixup! Build: Update toolchain script to produce distributable toolchain
Rootfs: Add script that build rootfs

Also add a basic defconfig for HS.

Signed-off-by: Anton Kolesov <Anton.Kolesov@synopsys.com>
Toolchain: Remove obsolete special script for uClibc

Signed-off-by: Anton Kolesov <Anton.Kolesov@synopsys.com>