mfd: lpc_ich: Add support for Intel Avoton SoC

This patch adds the LPC Controller Device IDs for Watchdog and GPIO for
Intel Avoton SoC, to the lpc_ich driver.

Signed-off-by: James Ralston <james.d.ralston@intel.com>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>