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Add INTEL_FORCE_PROBE, initial LNL devinfo and enable RT building on Xe2

Jordan Justen requested to merge jljusten/mesa:lnl-rt-compile into main

This MR enables building of grl/Ray Tracing on Xe2. But, intel_clc wants a basic struct intel_device_info for the platform which it gets by calling intel_device_name_to_pci_device_id() and intel_get_device_info_from_pci_id().

In order for this to work, we need some basic devinfo bits added, but it's still too early for LNL PCI IDs to be added, so I included !25481 (closed). This MR allows PCI IDs to be added, but they will only work if the INTEL_FORCE_PROBE env-var is set.

intel/dev: Add LNL device info include devinfo changes from @zehortigoza, @shadeslayer and @jxzgithub, so I added notes in the commit message to reflect this.

Cc: @kwg, @zehortigoza

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