mb/google/guybrush: Set BT USB to use GPIO for status

Set the BT USB device to use GPIO for the power status. This causes an
ACPI `_STA()` function to be generated that returns the power status of
the BT USB device, rather than always returning `0x1`. This `_STA()`
function can be used during boot to skip enabling the device (and
performing the associated sleep) if the device is already powered on.

BRANCH=None
BUG=b:225022810
TEST=Dump SSDT table for guybrush

Signed-off-by: Tim Van Patten <timvp@google.com>
Change-Id: I72f6b28671efddfbef53f328d904a05f73f39efa
Reviewed-on: https://review.coreboot.org/c/coreboot/+/63559
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Raul Rangel <rrangel@chromium.org>

src/mainboard/google/guybrush/variants/baseboard/devicetree.cb

@@ -321,6 +321,7 @@ chip soc/amd/cezanne
 							# TODO(rrangel): Find data sheet
 							register "enable_delay_ms" = "500"
 							register "enable_off_delay_ms" = "10"
+							register "use_gpio_for_status" = "true"
 							device ref usb2_port6 on end
 						end
 					end