cmd_log: print log->v2.con value in the "log info" command

print in the "log info" command, if "log_version = 2" also the
value from "log->v2.con".

Signed-off-by: Heiko Schocher <hs@denx.de>
Acked-by: Detlev Zundel <dzu@denx.de>