mfd: lpc_ich: Add Device IDs for Intel Wellsburg PCH

This patch adds the Watchdog Timer Device IDs for the Intel Wellsburg PCH

Signed-off-by: James Ralston <james.d.ralston@intel.com>
Acked-by: Peter Tyser <ptyser@xes-inc.com>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>