Mancomb: Add firmware config CBI definitions

The firmware config field in CBI lets us control initialization
parameters based on the OEM design.

BUG=b:188713024
TEST=Build

Signed-off-by: Martin Roth <martinroth@chromium.org>
Change-Id: I56ddc7218688919f20f41e0f143419c39d83849d
Reviewed-on: https://review.coreboot.org/c/coreboot/+/54732
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Raul Rangel <rrangel@chromium.org>

src/mainboard/google/mancomb/variants/mancomb/overridetree.cb

@@ -1,3 +1,20 @@
+# SPDX-License-Identifier: GPL-2.0-or-later
+fw_config
+	field WLAN 0 1
+		option WLAN_WCN6856 0
+		option WLAN_RTL8852 1
+	end
+	field BEEP_MODE 2 3
+		option BEEP_MODE_PIEZO 0
+		option BEEP_MODE_AMP 1
+		option BEEP_MODE_BIT_BANG 2
+	end
+	field SOC_TDP 4 5
+		option TDP_25_WATTS 0
+		option TDP_15_WATTS 1
+	end
+end
+
 chip soc/amd/cezanne
 
 	register "slow_ppt_limit_mW"         = "37500"