Update nfv for bullseye/Trixie

Aligned the package layout with the concurrent Debian packaging
conventions. Moved package files under 'debian/all/' to avoid
duplication across OS builds and removed legacy paths under 'debian/'.

Updated related build references to ensure compatibility across all
supported OS codenames.

Test-Plan:
PASS: master bullseye build
PASS: AIO-SX deploy

Story: 2011360
Task: 53417

Change-Id: I3e52f7d9066158ea9406f9cca813d1734f1cdd98
Signed-off-by: sharang bhardwaj <sharang.bhardwaj@windriver.com>

debian_trixie_iso_image_std.inc

@@ -0,0 +1,11 @@
+# List of packages to be included/installed in ISO
+
+#nfv
+nfv-client
+nfv-common
+nfv-plugins
+nfv-tools
+nfv-vim
+
+#nova-api-proxy
+nova-api-proxy

debian_trixie_pkg_dirs_std

@@ -0,0 +1,2 @@
+nfv
+nova-api-proxy