intel/fsp_baytrail: add Gold3 FSP support

Baytrail Gold3 FSP adds a couple of parameters in UPD_DATA_REGION
making platform more configurable via devicetree.cb
Update the UPD_DATA_REGION structure and pass settings to FSP

Add Baytrail Gold2 and earlier FSP backward compatible, as Gold3
FSP changes UPD_DATA_REGION struct

Change-Id: Ia2d2d0595328ac771762a84da40697a3b7e900c6
Signed-off-by: York Yang <york.yang@intel.com>
Reviewed-on: http://review.coreboot.org/7334
Reviewed-by: Martin Roth <gaumless@gmail.com>
Tested-by: build bot (Jenkins)