soc/intel/skylake: Enable HECI3 depending on devicetree configuration

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

I checked all corresponding mainboards if the devicetree configuration
matches the Heci3Enabled setting.

Change-Id: I4f99d434dfee49a9783e38c3910b9391d479cb83
Signed-off-by: Felix Singer <felixsinger@posteo.net>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/43864
Reviewed-by: Michael Niewöhner
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
diff --git a/src/soc/intel/skylake/chip.c b/src/soc/intel/skylake/chip.c
index 7dee333..a73aa8d 100644
--- a/src/soc/intel/skylake/chip.c
+++ b/src/soc/intel/skylake/chip.c
@@ -231,7 +231,9 @@
 
 	params->PchCio2Enable = config->Cio2Enable;
 	params->SaImguEnable = config->SaImguEnable;
-	params->Heci3Enabled = config->Heci3Enabled;
+
+	dev = pcidev_path_on_root(PCH_DEVFN_CSE_3);
+	params->Heci3Enabled = dev ? dev->enabled : 0;
 
 	params->LogoPtr = config->LogoPtr;
 	params->LogoSize = config->LogoSize;