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I915 DG1/LMEM RFC Section
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Upstream plan
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For upstream the overall plan for landing all the DG1 stuff and turning it for
real, with all the uAPI bits is:

* Merge basic HW enabling of DG1(still without pciid)
* Merge the uAPI bits behind special CONFIG_BROKEN(or so) flag
        * At this point we can still make changes, but importantly this lets us
          start running IGTs which can utilize local-memory in CI
* Convert over to TTM, make sure it all keeps working. Some of the work items:
        * TTM shrinker for discrete
        * dma_resv_lockitem for full dma_resv_lock, i.e not just trylock
        * Use TTM CPU pagefault handler
        * Route shmem backend over to TTM SYSTEM for discrete
        * TTM purgeable object support
        * Move i915 buddy allocator over to TTM
* Send RFC(with mesa-dev on cc) for final sign off on the uAPI
* Add pciid for DG1 and turn on uAPI for real