mb/google/brox: Remove CNVi Bluetooth

This is causing an assertion error on the devices that don't have CNVi
enabled because CNVi is hidden behind a FW_CONFIG flag in the
overridetree now.

BUG=b:319188820
BRANCH=None
TEST=emerge-brox coreboot chromeos-bootimage
     make sure we can boot to kernel on device.

Change-Id: Ifcfbc04825d4d4e7f2874a4c52f9c5cf3e657856
Signed-off-by: Shelley Chen <shchen@google.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/80211
Reviewed-by: Nick Vaccaro <nvaccaro@google.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
diff --git a/src/mainboard/google/brox/variants/baseboard/brox/devicetree.cb b/src/mainboard/google/brox/variants/baseboard/brox/devicetree.cb
index fd2c8ed..be31df6 100644
--- a/src/mainboard/google/brox/variants/baseboard/brox/devicetree.cb
+++ b/src/mainboard/google/brox/variants/baseboard/brox/devicetree.cb
@@ -23,9 +23,6 @@
 
 	register "tcc_offset" = "10"     # TCC of 90
 
-	# Enable CNVi BT
-	register "cnvi_bt_core" = "true"
-
 	register "usb2_ports[0]" = "USB2_PORT_TYPE_C(OC_SKIP)"  # USB2_C0
 	register "usb2_ports[1]" = "USB2_PORT_EMPTY"		# Disable USB2 Port
 	register "usb2_ports[2]" = "USB2_PORT_TYPE_C(OC_SKIP)"  # USB2_C2