drm/i915: Do not cover all future platforms in TLB invalidation

Revert to the original explicit approach and document the reasoning
behind it.

v2:
 * DG2 needs to be covered too. (Matt)

v3:
 * Full version check for Gen12 to avoid catching all future platforms.
   (Matt)

v4:
 * Be totally explicit on the Gen12 branch. (Andrzej)

Signed-off-by: Tvrtko Ursulin <[email protected]>
Cc: Matt Roper <[email protected]>
Cc: Balasubramani Vivekanandan <[email protected]>
Cc: Andrzej Hajda <[email protected]>
Reviewed-by: Andrzej Hajda <[email protected]> # v1
Reviewed-by: Matt Roper <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]

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