mb/google/brya/var/brya0: add new THERMAL FW_CONFIG field

Add a new THERMAL FW_CONFIG bitfield for describing power consumption
category of SoC.

BUG=b:250089101
TEST="emerge-brya coreboot chromeos-bootimage", flash and boot brya0
and skolas to kernel.

Change-Id: Iba3bd87abd4c112ceff4bbe51a7cf9eae3a694f2
Signed-off-by: Nick Vaccaro <nvaccaro@google.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/68025
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Sumeet R Pawnikar <sumeet.r.pawnikar@intel.com>
Reviewed-by: YH Lin <yueherngl@google.com>
Reviewed-by: Tarun Tuli <taruntuli@google.com>

src/mainboard/google/brya/variants/brya0/overridetree.cb

@@ -37,6 +37,10 @@ fw_config
 		option HPS_ABSENT               0
 		option HPS_PRESENT              1
 	end
+	field THERMAL 18 18
+		option THERMAL_28W		0
+		option THERMAL_15W		1
+	end
 end
 
 chip soc/intel/alderlake

src/mainboard/google/brya/variants/skolas/overridetree.cb

@@ -37,6 +37,10 @@ fw_config
 		option HPS_ABSENT               0
 		option HPS_PRESENT              1
 	end
+	field THERMAL 18 18
+		option THERMAL_28W		0
+		option THERMAL_15W		1
+	end
 end
 
 chip soc/intel/alderlake