mb/*: Update SPD mapping for sandybridge boards

Boards without HAVE_SPD_IN_CBFS: Move SPD mapping into devicetree.

Boards with HAVE_SPD_IN_CBFS: Convert to Haswell-style SPD mapping.

Change-Id: Id6ac0a36b2fc0b9686f6e875dd020ae8dba72a72
Signed-off-by: Keith Hui <buurin@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/76967
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Martin L Roth <gaumless@gmail.com>
diff --git a/src/mainboard/intel/dcp847ske/devicetree.cb b/src/mainboard/intel/dcp847ske/devicetree.cb
index 37304f2..f4e948f 100644
--- a/src/mainboard/intel/dcp847ske/devicetree.cb
+++ b/src/mainboard/intel/dcp847ske/devicetree.cb
@@ -13,6 +13,7 @@
 
 	# 1333MHz RAM frequency
 	register "max_mem_clock_mhz" = "666"
+	register "spd_addresses" = "{0x50, 0, 0x51, 0}"
 
 	register "usb_port_config" = "{
 		{1, 0, 0x0040},