Revert "Pre-download DCGM/fabricmanager debs on host to bypass chroot apt"

This reverts commit 4110dbf8a6.

iso/builder/build.sh

@@ -1296,18 +1296,6 @@ if [ -f "${LB_INCLUDES}/root/.ssh/authorized_keys" ]; then
     chmod 600 "${LB_INCLUDES}/root/.ssh/authorized_keys"
 fi
 
-# --- pre-download NVIDIA apt packages into config/packages.chroot ---
-# live-build creates a local apt repo from config/packages.chroot/*.deb so the
-# chroot can install them without reaching the NVIDIA CUDA HTTPS source.
-if [ "$BEE_GPU_VENDOR" = "nvidia" ]; then
-    run_step "download DCGM ${DCGM_VERSION} / fabricmanager ${NVIDIA_FABRICMANAGER_VERSION} packages" \
-        "25-dcgm" \
-        sh "${BUILDER_DIR}/build-dcgm.sh" \
-        "${DCGM_VERSION}" \
-        "${NVIDIA_FABRICMANAGER_VERSION}" \
-        "${LB_DIR}"
-fi
-
 # --- build ISO using live-build ---
 echo ""
 echo "=== building ISO (variant: ${BUILD_VARIANT}) ==="