mb/google/skyrim: Add new mainboard

Skyrim is a new Google mainboard with AMD Sabrina SOC.

BUG=b:214413553
TEST=util/abuild/abuild -t GOOGLE_SKYRIM --clean

Change-Id: I008fea4aa163b8aa66e86735b29b3fdc4e08a327
Signed-off-by: Karthikeyan Ramasubramanian <kramasub@google.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/61565
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Raul Rangel <rrangel@chromium.org>
Reviewed-by: Jon Murphy <jpmurphy@google.com>

src/mainboard/google/skyrim/Kconfig

@@ -0,0 +1,35 @@
+# SPDX-License-Identifier: GPL-2.0-or-later
+
+config BOARD_GOOGLE_BASEBOARD_SKYRIM
+	def_bool n
+
+if BOARD_GOOGLE_BASEBOARD_SKYRIM
+
+config AMD_FWM_POSITION_INDEX
+	int
+	default 3
+	help
+	  TODO: might need to be adapted for better placement of files in cbfs
+
+config BOARD_SPECIFIC_OPTIONS
+	def_bool y
+	select BOARD_ROMSIZE_KB_16384
+	select SOC_AMD_SABRINA
+
+config DEVICETREE
+	default "variants/baseboard/devicetree.cb"
+
+config FMDFILE
+	default "src/mainboard/\$(CONFIG_MAINBOARD_DIR)/chromeos.fmd"
+
+config MAINBOARD_DIR
+	default "google/skyrim"
+
+config MAINBOARD_FAMILY
+	string
+	default "Google_Skyrim"
+
+config MAINBOARD_PART_NUMBER
+	default "Skyrim" if BOARD_GOOGLE_SKYRIM
+
+endif # BOARD_GOOGLE_BASEBOARD_SKYRIM