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.
kubernetes-unversioned
isolcpus-device-plugin
Change-Id: Ie196a14e44673871b0702f077f1c2f1f9013d20f
Signed-off-by: pmp1 <preetham.mp@windriver.com>