drivers/usb/intel_bluetooth: Use correct function to close scope

The scope should be closed with `acpigen_write_scope_end`, rather
than `acpigen_pop_len`.

Change-Id: I80df2ee1b51d7dbba85e556bee0fd7513ac933bb
Signed-off-by: Sean Rhodes <sean@starlabs.systems>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/86500
Reviewed-by: Matt DeVillier <matt.devillier@gmail.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

src/drivers/usb/acpi/intel_bluetooth.c

@@ -352,5 +352,5 @@ void acpi_device_intel_bt_common(unsigned int enable_gpio, unsigned int reset_gp
 	}
 	acpigen_pop_len();
 
-	acpigen_pop_len();
+	acpigen_write_scope_end();
 }