realtek: Fix tc default package
The tc package does not exits any more, it was split into tc-tiny,
tc-full and tc-bpf. Include tc-bpf by default into realtek images.
This increases the compressed image size by about 232KBytes.
Tested-by: Stijn Segers <[email protected]>
Signed-off-by: Hauke Mehrtens <[email protected]>