mb/google/rex/variants/screebo: add FW_CONFIG for audio/DB

This patch adds FW_CONFIG to accommodate different Screebo BOM
components across various SKUs.

1. DB_CONFIG for DB_TPEC/DB_TBT/DB_UNKOWN
2. AUDIO for ALC1019_ALC5682I_I2S/AUDIO_UNKNOWN

BUG=b:278169268
TEST=build pass

Change-Id: I928aae61d4936509a7b68f4041c0cd72f298e83d
Signed-off-by: Simon Zhou <zhouguohui@huaqin.corp-partner.google.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/75573
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: YH Lin <yueherngl@google.com>
Reviewed-by: Subrata Banik <subratabanik@google.com>
Reviewed-by: Mac Chiang <mac.chiang@intel.com>
Reviewed-by: Kapil Porwal <kapilporwal@google.com>
diff --git a/src/mainboard/google/rex/variants/screebo/overridetree.cb b/src/mainboard/google/rex/variants/screebo/overridetree.cb
index ca4d9a9..aa99a6b 100644
--- a/src/mainboard/google/rex/variants/screebo/overridetree.cb
+++ b/src/mainboard/google/rex/variants/screebo/overridetree.cb
@@ -1,4 +1,13 @@
 fw_config
+	field AUDIO 0 1
+		option AUDIO_UNKNOWN		0
+		option ALC1019_ALC5682I_I2S	1
+	end
+	field DB_CONFIG 2 4
+		option DB_UNKNOWN		0
+		option DB_TYPEC			1
+		option DB_TBT			2
+	end
 	field MB_CONFIG 5 7
 		option MB_UNKNOWN		0
 		option MB_TYPEC			1