soc/intel/cnl: Enable HECI3 depending on devicetree

Currently HECI3 gets enabled by the option Heci3Enabled, but this
duplicates the devicetree on/off options. Therefore depend on the
devicetree for enablement of the HECI3 controller.

All corresponding mainboards were checked if the devicetree
configuration matches the Heci3Enabled setting, and divergent
devicetrees were adjusted.

Change-Id: Ic7d52096aee225c2ced1e1bc29ca850fe5073edc
Signed-off-by: Felix Singer <felix.singer@secunet.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/44579
Reviewed-by: Michael Niewöhner
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
diff --git a/src/mainboard/prodrive/hermes/devicetree.cb b/src/mainboard/prodrive/hermes/devicetree.cb
index 69323f2..5615554 100644
--- a/src/mainboard/prodrive/hermes/devicetree.cb
+++ b/src/mainboard/prodrive/hermes/devicetree.cb
@@ -28,7 +28,7 @@
 			register "HeciEnabled" = "1"
 		end
 		device pci 16.1 on  end # Management Engine Interface 2
-		device pci 16.4 on  end # Management Engine Interface 3
+		device pci 16.4 off end # Management Engine Interface 3
 		device pci 17.0 on  end # SATA
 		device pci 1d.6 on	# PCIe root port 15
 			device pci 00.0 on      # Aspeed PCI Bridge