mb/google/volteer/var/voema: Add memory parts and generate DRAM IDs

This change adds memory parts used by variant voema to
mem_parts_used.txt and generates DRAM IDs allocated to these parts.

Added memory
1. MT53E512M64D4NW-046 WT:E
2. MT53E1G64D8NW-046 WT:E

BUG=b:171755775
TEST=emerge-volteer coreboot chromeos-bootimage

Signed-off-by: David Wu <david_wu@quanta.corp-partner.google.com>
Change-Id: I24d466f92a7e0fa3ab2f6241f0b5af025c53ed98
Reviewed-on: https://review.coreboot.org/c/coreboot/+/47228
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Paul Fagerburg <pfagerburg@chromium.org>
Reviewed-by: Caveh Jalali <caveh@chromium.org>

src/mainboard/google/volteer/variants/voema/memory/Makefile.inc

@@ -1,5 +1,6 @@
 ## SPDX-License-Identifier: GPL-2.0-or-later
 ## This is an auto-generated file. Do not edit!!
-## Add memory parts in mem_parts_used.txt and run spd_tools to regenerate.
 
-SPD_SOURCES = placeholder.spd.hex
+SPD_SOURCES =
+SPD_SOURCES += lp4x-spd-1.hex      # ID = 0(0b0000)  Parts = MT53E512M64D4NW-046 WT:E
+SPD_SOURCES += lp4x-spd-3.hex      # ID = 1(0b0001)  Parts = MT53E1G64D8NW-046 WT:E

src/mainboard/google/volteer/variants/voema/memory/dram_id.generated.txt

@@ -1 +1,3 @@
 DRAM Part Name                 ID to assign
+MT53E512M64D4NW-046 WT:E       0 (0000)
+MT53E1G64D8NW-046 WT:E         1 (0001)

src/mainboard/google/volteer/variants/voema/memory/mem_parts_used.txt

@@ -1,4 +1,2 @@
-# This is a CSV file containing a list of memory parts used by this variant.
-# Generate an updated Makefile.inc and dram_id.generated.txt by running the
-# gen_part_id tool from util/spd_tools/ddr4 or util/spd_tools/lp4x
-# See util/spd_tools/{ddr4,lp4x}/README.md for more details and instructions.
+MT53E512M64D4NW-046 WT:E
+MT53E1G64D8NW-046 WT:E