mb/google/glados/var/lars: Set SKU ID based on VPD

LARS has two variants, LARS and LILI, which are differentiated via
the customization_id field in the VPD. To make differentiation easier
outside of ChromeOS (ie, for Windows/Linux drivers), set the SKU ID
based on VPD so it can be easily read via SMBIOS.

Modeled after similar code in google/reef (snappy variant).

TEST=build/boot lili variant, verify sku1 populated in SMBIOS tables.

Change-Id: I148462b6f86b25fa8db26ea6e1537d1a5e47984b
Signed-off-by: Matt DeVillier <matt.devillier@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/68754
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Paul Menzel <paulepanter@mailbox.org>
Reviewed-by: Angel Pons <th3fanbus@gmail.com>

src/mainboard/google/glados/variants/lars/variant.c

@@ -3,7 +3,9 @@
 #include <stdint.h>
 #include <string.h>
 #include <baseboard/variant.h>
+#include <drivers/vpd/vpd.h>
 #include <fsp/soc_binding.h>
+#include <smbios.h>
 
 #define K4E6E304EB_MEM_ID	0x5
 
@@ -14,6 +16,9 @@
 #define MEM_SINGLE_CHANB	0xb
 #define MEM_SINGLE_CHANC	0xc
 
+#define VPD_KEY_CUSTOMIZATION_ID    "customization_id"
+#define VPD_CUSTOMIZATION_LEN        32
+
 void variant_memory_init_params(FSPM_UPD *mupd, const int spd_index)
 {
 	FSP_M_CONFIG *mem_cfg;
@@ -63,3 +68,23 @@ int is_dual_channel(const int spd_index)
 		&& spd_index != MEM_SINGLE_CHANB
 		&& spd_index != MEM_SINGLE_CHANC);
 }
+
+/* SKU ID enumeration */
+#define SKU_LARS	"sku0"
+#define SKU_LILI	"sku1"
+
+const char *smbios_system_sku(void)
+{
+	if (!CONFIG(VPD))
+		return SKU_LARS;
+
+	static char customization_id[VPD_CUSTOMIZATION_LEN];
+	if (!vpd_gets(VPD_KEY_CUSTOMIZATION_ID, customization_id,
+				VPD_CUSTOMIZATION_LEN, VPD_RO))
+		return SKU_LARS;
+
+	if (strstr(customization_id, "LILI"))
+		return SKU_LILI;
+
+	return SKU_LARS;
+}