drm/i915/tgl: Register state context definition for Gen12

Gen12 has subtle changes in the reg state context offsets (some fields
are gone, some are in a different location), compared to previous Gens.

The simplest approach seems to be keeping Gen12 (and future platform)
changes apart from the previous gens, while keeping the registers that
are contiguous in functions we can reuse.

v2: alias, virtual engine, rpcs, prune unused regs
v3: use engine base (Daniele), take ctx_bb for all

Bspec: 46255
Cc: Michal Wajdeczko <[email protected]>
Cc: Daniele Ceraolo Spurio <[email protected]>
Cc: Chris Wilson <[email protected]>
Cc: Joonas Lahtinen <[email protected]>
Cc: José Roberto de Souza <[email protected]>
Signed-off-by: Michel Thierry <[email protected]>
Signed-off-by: Lucas De Marchi <[email protected]>
Signed-off-by: Mika Kuoppala <[email protected]>
Reviewed-by: Daniele Ceraolo Spurio <[email protected]>
Tested-by: Daniele Ceraolo Spurio <[email protected]>
[ickle: Tweaked the GEM_WARN_ON after settling on a compromise with
Daniele]
Signed-off-by: Chris Wilson <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]

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