mb/google/brox/var/lotso: Add FW_CONFIG for FP

This patch adds FW_CONFIG to accommodate different Lotso BoM
components across various SKUs.
1. Fingerprint sensor - FP Present/Absent

BUG=b:350360162
BRANCH=None
TEST=Boot image on SKU2 and check FP working.

Change-Id: I1ee5fcd1c29099bdbee741ef76c00cf45fcc1189
Signed-off-by: Wentao Qin <qinwentao@huaqin.corp-partner.google.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/83388
Reviewed-by: Eric Lai <ericllai@google.com>
Reviewed-by: Karthik Ramasubramanian <kramasub@google.com>
Reviewed-by: Subrata Banik <subratabanik@google.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

src/mainboard/google/brox/variants/lotso/overridetree.cb

@@ -6,8 +6,8 @@ fw_config
 	end
 	field STORAGE 2 3
 		option STORAGE_UNKNOWN		0
-		option STORAGE_UFS			1
-		option STORAGE_NVME			2
+		option STORAGE_UFS		1
+		option STORAGE_NVME		2
 	end
 	field WIFI_BT 4 4
 		option WIFI_CNVI_WIFI6E		0
@@ -15,17 +15,21 @@ fw_config
 	end
 	field AUDIO 5 7
 		option AUDIO_UNKNOWN		0
-		option AUDIO_REALTEK_ALC256		1
+		option AUDIO_REALTEK_ALC256	1
 		option AUDIO_REALTEK_ALC3287	2
 	end
 	field UFC 8 9
-		option UFC_NONE		0
-		option UFC_USB		1
+		option UFC_NONE			0
+		option UFC_USB			1
 	end
 	field KB_BL 10 10
-		option KB_BL_ABSENT			0
+		option KB_BL_ABSENT		0
 		option KB_BL_PRESENT		1
 	end
+	field FP 11 12
+		option FP_PRESENT		0
+		option FP_ABSENT		1
+	end
 	field ISH 21
 		option ISH_DISABLE		0
 		option ISH_ENABLE		1