mb/amd/onyx: Add minimal code for onyx compilation

Change-Id: I25807e116869d1bd7b8324525bc5ae1691e072e4
Signed-off-by: Varshit Pandya <pandyavarshit@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/77601
Reviewed-by: Martin L Roth <gaumless@gmail.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

src/mainboard/amd/onyx/Kconfig

@@ -0,0 +1,14 @@
+if BOARD_AMD_ONYX
+
+config BOARD_SPECIFIC_OPTIONS
+	def_bool y
+	select SOC_AMD_GENOA
+	select MISSING_BOARD_RESET
+
+config MAINBOARD_DIR
+	default "amd/onyx"
+
+config MAINBOARD_PART_NUMBER
+	default "Onyx"
+
+endif

src/mainboard/amd/onyx/Kconfig.name

@@ -0,0 +1,2 @@
+config BOARD_AMD_ONYX
+	bool "Onyx"

src/mainboard/amd/onyx/board_info.txt

@@ -0,0 +1 @@
+Category: eval

src/mainboard/amd/onyx/devicetree.cb

@@ -0,0 +1,6 @@
+chip soc/amd/genoa
+
+	device domain 0 on
+	end
+
+end

src/mainboard/amd/onyx/dsdt.asl

@@ -0,0 +1,13 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+
+/* DefinitionBlock Statement */
+#include <acpi/acpi.h>
+DefinitionBlock (
+	"dsdt.aml",
+	"DSDT",
+	ACPI_DSDT_REV_2,
+	OEM_ID,
+	ACPI_TABLE_CREATOR,
+	0x00010001	/* OEM Revision */
+)
+} /* End of ASL file */