mb/google/rex/var/karis: sync CBI FW_CONFIG definitions

Sync'ing Karis' FW_CONFIG definitions stored in CBI,

```
_FW_MASKS = struct(
    DB_USB = 0x00000003,  # bit1~bit0
    STYLUS = 0x00000004,  # bit2
    AMP = 0x00000038,  # bit5~bit3
    FAN = 0x000000C0,  # bit7~bit6
    MIPI_CAM = 0x00000300,  # bit9 ~ bit8
    FP_MCU = 0x00000C00,  # bit11 ~ bit10
    KB_TYPE = 0x00001000,  # bit12
    WIFI_TYPE = 0x00002000,  # bit13
)

_FW_CONFIGS = struct(
    DB_USB_UNKNOWN = hw_topo.make_fw_config(_FW_MASKS.DB_USB, 0),
    DB_USB4_ANX7452 = hw_topo.make_fw_config(_FW_MASKS.DB_USB, 1),
    STYLUS_ABSENT = hw_topo.make_fw_config(_FW_MASKS.STYLUS, 0),
    STYLUS_PRESENT = hw_topo.make_fw_config(_FW_MASKS.STYLUS, 1),
    AUDIO_ALC5650 = hw_topo.make_fw_config(_FW_MASKS.AMP, 0),
    FP_MCU_ABSENT = hw_topo.make_fw_config(_FW_MASKS.FP_MCU, 0),
    FP_MCU_NUVOTON = hw_topo.make_fw_config(_FW_MASKS.FP_MCU, 1),
    FP_MCU_ELAN = hw_topo.make_fw_config(_FW_MASKS.FP_MCU, 2),
    WIFI_TYPE_CNVI = hw_topo.make_fw_config(_FW_MASKS.WIFI_TYPE, 0),
    WIFI_TYPE_PCIE = hw_topo.make_fw_config(_FW_MASKS.WIFI_TYPE, 1),
    MIPI_UF_CAM_HI556 = hw_topo.make_fw_config(_FW_MASKS.MIPI_CAM, 0),
)
```

BUG=b:290689824
TEST=emerge-rex coreboot

Change-Id: I1e4965c009edc595f24c04ac82d81aa0e723bbf3
Signed-off-by: YH Lin <yueherngl@google.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/78261
Reviewed-by: Eric Lai <ericllai@google.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Sumeet R Pawnikar <sumeet.r.pawnikar@intel.com>
Reviewed-by: Subrata Banik <subratabanik@google.com>
diff --git a/src/mainboard/google/rex/variants/karis/overridetree.cb b/src/mainboard/google/rex/variants/karis/overridetree.cb
index 545a7b3..e6164c9 100644
--- a/src/mainboard/google/rex/variants/karis/overridetree.cb
+++ b/src/mainboard/google/rex/variants/karis/overridetree.cb
@@ -1,4 +1,8 @@
 fw_config
+	field DB_USB 0 1
+		option DB_USB_UNKNOWN		0
+		option DB_USB4_ANX7452		1
+	end
 	field STYLUS 2
 		option STYLUS_ABSENT		0
 		option STYLUS_PRESENT		1
@@ -15,6 +19,10 @@
 	field FP_MCU 10 11
 		option FP_ABSENT		0
 		option FP_MCU_NUVOTON		1
+		option FP_MCU_ELAN		2
+	end
+	field KB_TYPE 12
+		option KB_TYPE_DEFAULT		0
 	end
 	field WIFI_TYPE 13
 		option WIFI_CNVI		0