[PATCH trivial] net: add bbr to config DEFAULT_TCP_CONG

[Markus Trippelsdorf]

While playing with BBR I noticed that it was missing in the list of
possible config DEFAULT_TCP_CONG choices. Fixed thusly.

Signed-off-by: Markus Trippelsdorf <mar...@trippelsdorf.de>

diff --git a/net/ipv4/Kconfig b/net/ipv4/Kconfig
index 300b06888fdf..b54b3ca939db 100644
--- a/net/ipv4/Kconfig
+++ b/net/ipv4/Kconfig
@@ -715,6 +715,7 @@ config DEFAULT_TCP_CONG
        default "reno" if DEFAULT_RENO
        default "dctcp" if DEFAULT_DCTCP
        default "cdg" if DEFAULT_CDG
+       default "bbr" if DEFAULT_BBR
        default "cubic"
 
 config TCP_MD5SIG

-- 
Markus