X201: set default USB debug controller to 2.

The other port is not easily accessible.

Change-Id: I6ea31346a375debcd5fc1c27e4078e3a436715e3
Signed-off-by: Vladimir Serbinenko <phcoder@gmail.com>
Reviewed-on: http://review.coreboot.org/4635
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
Tested-by: build bot (Jenkins)
Reviewed-by: Kyösti Mälkki <kyosti.malkki@gmail.com>

src/mainboard/lenovo/x201/Kconfig

@@ -43,6 +43,10 @@ config IRQ_SLOT_COUNT
 	int
 	default 18
 
+config USBDEBUG_HCD_INDEX
+	int
+	default 2
+
 config DRAM_RESET_GATE_GPIO
 	int
 	default 10