drivers/tty/serial/8250/8250_core.c: remove CONFIG_HUB6

This file local CPP identifier is not referenced anywhere else, so we
can safely remove it.
Signed-off-by: NValentin Rothberg <valentinrothberg@gmail.com>
Reviewed-by: NPeter Hurley <peter@hurleysoftware.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/tty/serial/8250/8250_core.c

@@ -92,11 +92,6 @@ static unsigned int skip_txen_test; /* force skip of txen test at init time */
 #define CONFIG_SERIAL_MANY_PORTS 1
 #endif
 
-/*
- * HUB6 is always on.  This will be removed once the header
- * files have been cleaned.
- */
-#define CONFIG_HUB6 1
 
 #include <asm/serial.h>
 /*