The darp10 has a second fan but no dGPU. The NFAN Method must exist, so
use the default hwmon names of "fan1" and "fan2" for labels.
Change-Id: I553deefea374b9dd916be6611850fca61afd490d
Signed-off-by: Tim Crawford <tcrawford@system76.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/87068
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Jeremy Soller <jeremy@system76.com>