mfd: lpc_sch: Enable WDT for Intel Quark X1000

Quark X1000 uses ie6xx_wdt driver for WDT. To enable WDT, we declare WDT IO
resource size for Quark X1000.

Signed-off-by: Ong Boon Leong <boon.leong.ong@intel.com>
Signed-off-by: Lee Jones <lee.jones@linaro.org>