The option was introduced in upstream linux commit a6484045 ("[TCP]: Do
not present confusing congestion control options by default.").
The option is set to y in generic config and to the moment does not
incur additional size increment. Make it y for all so that packages
such as kmod-tcp-bbr do not have to set it on every occasion
Signed-off-by: Yousong Zhou <yszhou4tech@gmail.com>