drm/i915: Add the gen12_needs_ccs_aux_inv helper

We always assumed that a device might either have AUX or FLAT
CCS, but this is an approximation that is not always true, e.g.
PVC represents an exception.

Set the basis for future finer selection by implementing a
boolean gen12_needs_ccs_aux_inv() function that tells whether aux
invalidation is needed or not.

Currently PVC is the only exception to the above mentioned rule.

Requires: 059ae7ae2a1c ("drm/i915/gt: Cleanup aux invalidation registers")
Signed-off-by: Andi Shyti <[email protected]>
Cc: Matt Roper <[email protected]>
Cc: Jonathan Cavitt <[email protected]>
Cc: <[email protected]> # v5.8+
Reviewed-by: Matt Roper <[email protected]>
Reviewed-by: Andrzej Hajda <[email protected]>
Reviewed-by: Nirmoy Das <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]

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