Change in coreboot[master]: soc/intel: Remove SMM HECI disable related options

[Karthik Ramasubramanian (Code Review)]

Attention is currently required from: Martin Roth, Furquan Shaikh, Aseda Aboagye, Aaron Durbin.
Karthik Ramasubramanian has posted comments on this change. ( https://review.coreboot.org/c/coreboot/+/52147 )

Change subject: soc/intel: Remove SMM HECI disable related options
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Patch Set 3:

(1 comment)

File src/soc/intel/cannonlake/smihandler.c:

https://review.coreboot.org/c/coreboot/+/52147/comment/1e354fb5_bd971ee5 
PS2, Line 22: 	const struct device *dev = pcidev_path_on_root(PCH_DEVFN_CSE);
            : 	if (!is_dev_enabled(dev))
> CNL doesn't consult the devicetree here. […]

The concerned PCI device (device pci 16.0) is also enabled/disabled in devicetree. So I believe the check is sufficient.