bpftool: Add bash-completion for tcx subcommand

This commit adds bash-completion for attaching tcx program on interface.
Signed-off-by: Tao Chen <chen.dylane@gmail.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Quentin Monnet <qmo@kernel.org>
Link: https://lore.kernel.org/bpf/20240721144238.96246-1-chen.dylane@gmail.comSigned-off-by: Andrii Nakryiko <andrii@kernel.org>

tools/bpf/bpftool/bash-completion/bpftool

@@ -1079,7 +1079,7 @@ _bpftool()
             esac
             ;;
         net)
-            local ATTACH_TYPES='xdp xdpgeneric xdpdrv xdpoffload'
+            local ATTACH_TYPES='xdp xdpgeneric xdpdrv xdpoffload tcx_ingress tcx_egress'
             case $command in
                 show|list)
                     [[ $prev != "$command" ]] && return 0