Add supported memory parts in the mem_list_variant.txt and generate the
SPD ID for the parts. The memory parts being added are:
1. Samsung K4U6E3S4AA-MGCR
BUG=b:214460184
TEST=emerge-dedede coreboot
Signed-off-by: FrankChu <frank_chu@pegatron.corp-partner.google.com>
Change-Id: Ief75fcb7a8f1c25feaf05b1535a9528a351b23b0
Reviewed-on: https://review.coreboot.org/c/coreboot/+/61105
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Karthik Ramasubramanian <kramasub@google.com>