device/dram/ddr2.c: Store the checksum in the decoded SPD struct

Change-Id: I53f4a3e4030ea19e10c0fe11a99a3480644f5fae
Signed-off-by: Arthur Heymans <arthur@aheymans.xyz>
Reviewed-on: https://review.coreboot.org/21676
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
Reviewed-by: Patrick Rudolph <siro@das-labor.org>

src/device/dram/ddr2.c

@@ -322,6 +322,7 @@ int spd_decode_ddr2(struct dimm_attr_st *dimm, u8 spd[SPD_SIZE_MAX_DDR2])
 		dimm->dram_type = SPD_MEMORY_TYPE_UNDEFINED;
 		return SPD_STATUS_CRC_ERROR;
 	}
+	dimm->checksum = spd[63];
 
 	reg8 = spd[62];
 	if ((reg8 & 0xf0) != 0x10) {

src/include/device/dram/ddr2.h

@@ -186,6 +186,7 @@ struct dimm_attr_st {
 	u32 tPLL;
 	u32 tRR;
 
+	u8 checksum;
 	/* Manufacturer ID */
 	u32 manufacturer_id;
 	/* ASCII part number - NULL terminated */