Aligned the package layout with the concurrent Debian packaging
conventions. Relocated package files under 'debian/bullseye/' and removed legacy paths under 'debian/'.
Updated related build references to ensure compatibility with Bullseye.
cloud-init
kvm-timer-advance
libvirt-python
Change-Id: Ie9a90d6a9bec6ef999b2df2fd95a9937ab318746
Signed-off-by: pmp1 <preetham.mp@windriver.com>