cyrus: Enable STDIO deregister

If CONFIG_SYS_STDIO_DEREGISTER is not enabled, usb reset
will fail every time. Enabling it allows usb reset to
work.
Signed-off-by: NAndy Fleming <afleming@gmail.com>

include/configs/cyrus.h

@@ -476,6 +476,7 @@
 #define CONFIG_CMD_EXT2
 #define CONFIG_EHCI_IS_TDI
 #define CONFIG_USB_KEYBOARD
+#define CONFIG_SYS_STDIO_DEREGISTER
 #define CONFIG_SYS_USB_EVENT_POLL
  /* _VIA_CONTROL_EP  */
 #define CONFIG_CONSOLE_MUX