mb/google/poppy/variant/nami: add the vbt setting for bard sku

Modify the vbios's eDP signal setting from level0(0dB)
to level1 (3.5dB) for bard
Add VBT blobs and include it in cbfs

BUG=b:119448457
TEST=Test & measure eDP signal

Change-Id: I0b854a6adad43844282aed61d26e798727b5cb62
Signed-off-by: Ren Kuo <ren.kuo@quanta.corp-partner.google.com>
Reviewed-on: https://review.coreboot.org/c/30375
Reviewed-by: Arthur Heymans <arthur@aheymans.xyz>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

src/mainboard/google/poppy/variants/nami/Makefile.inc

@@ -41,3 +41,5 @@ smm-$(CONFIG_HAVE_SMI_HANDLER) += smihandler.c
 cbfs-files-y += oem.bin
 oem.bin-file := $(call strip_quotes,$(CONFIG_OEM_BIN_FILE))
 oem.bin-type := raw
+
+$(call add_vbt_to_cbfs, vbt-bard.bin, bard-data.vbt)

src/mainboard/google/poppy/variants/nami/mainboard.c

@@ -205,6 +205,11 @@ const char *mainboard_vbt_filename(void)
 	case SKU_0_AKALI360:
 	case SKU_1_AKALI360:
 		return "vbt-akali.bin";
+	case SKU_0_BARD:
+	case SKU_1_BARD:
+	case SKU_2_BARD:
+	case SKU_3_BARD:
+		return "vbt-bard.bin";
 	default:
 		return "vbt.bin";
 		break;