spd: Generate SPDs under spd/ using unified spd_gen tool

Use the new unified version of the spd_gen tool to generate all LP4x and
DDR4 SPDs, storing them in a new spd/ directory. Storing them in a
common location allows platforms with the same SPD requirements to share
SPD files, reducing duplication compared to storing SPDs in soc/ and
mainboard/ directories.

For each memory technology there are multiple sets of SPDs. Each set
corresponds to a set of platforms with different SPD requirements, e.g.
due to different memory training code expectations. A manifest file
(platforms_manifest.generated.txt) lists the platform -> set mappings.

Commands used to generate SPDs:
cp util/spd_tools/lp4x/global_lp4x_mem_parts.json.txt \
    spd/lp4x/memory_parts.json
cp util/spd_tools/ddr4/global_ddr4_mem_parts.json.txt \
    spd/ddr4/memory_parts.json
util/spd_tools/bin/spd_gen spd/lp4x/memory_parts.json lp4x
util/spd_tools/bin/spd_gen spd/ddr4/memory_parts.json ddr4

BUG=b:191776301
TEST=None

Signed-off-by: Reka Norman <rekanorman@google.com>
Change-Id: Iac82847a1a0c1f2e7271d0d3b3a7261849813a24
Reviewed-on: https://review.coreboot.org/c/coreboot/+/57514
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Karthik Ramasubramanian <kramasub@google.com>

spd/ddr4/set-0/parts_spd_manifest.generated.txt

@@ -0,0 +1,22 @@
+# Generated by:
+# util/spd_tools/bin/spd_gen spd/ddr4/memory_parts.json ddr4
+
+H5AN8G6NDJR-XNC,spd-1.hex
+MT40A512M16TB-062E:J,spd-1.hex
+H5ANAG6NCMR-XNC,spd-2.hex
+HMA851S6CJR6N-VK,spd-3.hex
+K4A8G165WC-BCTD,spd-3.hex
+H5AN8G6NCJR-VKC,spd-3.hex
+MT40A1G16KNR-075:E,spd-4.hex
+K4AAG165WB-MCTD,spd-5.hex
+H5ANAG6NCMR-VKC,spd-6.hex
+K4A8G165WC-BCWE,spd-1.hex
+MT40A1G16KD-062E:E,spd-7.hex
+K4AAG165WA-BCWE,spd-7.hex
+H5AN8G6NCJR-XNC,spd-1.hex
+K4AAG165WA-BCTD,spd-8.hex
+H5ANAG6NDMR-XNC,spd-2.hex
+H5ANAG6NCJR-XNC,spd-9.hex
+K4AAG165WB-BCWE,spd-9.hex
+MT40A1G16RC-062E:B,spd-9.hex
+MT40A512M16TB-062E:R,spd-1.hex

spd/ddr4/set-0/spd-1.hex

@@ -0,0 +1,32 @@
+23 11 0C 03 45 21 00 08 00 00 00 00 02 03 00 00
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spd/ddr4/set-0/spd-2.hex

@@ -0,0 +1,32 @@
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spd/ddr4/set-0/spd-3.hex

@@ -0,0 +1,32 @@
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spd/ddr4/set-0/spd-4.hex

@@ -0,0 +1,32 @@
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spd/ddr4/set-0/spd-5.hex

@@ -0,0 +1,32 @@
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spd/ddr4/set-0/spd-6.hex

@@ -0,0 +1,32 @@
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spd/ddr4/set-0/spd-7.hex

@@ -0,0 +1,32 @@
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spd/ddr4/set-0/spd-8.hex

@@ -0,0 +1,32 @@
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spd/ddr4/set-0/spd-9.hex

@@ -0,0 +1,32 @@
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spd/ddr4/set-0/spd-empty.hex

@@ -0,0 +1,32 @@
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