Revert "download_from_ci: Download vmlinux" This reverts commit b0719ec4a14d02f31f00f0448f2e3165e1fe641e. Reason for revert: b/421990777 (vmlinux will not be packaged with virtual device prebuilts. They will be managed separately in system/bpf/include/vmlinux since BPF needs to support building against older kernels not supported by the virtual device) Bug: 421990777 Change-Id: Ib52ebda64703cb2488aa6400d24c51a1ed7b369f