drm/i915: Use a helper to get the aux power domain

From ICL onwards the AUX power domain may change dynamically based on
whether a DDI/TypeC port is in thunderbolt or non-thunderbolt mode, so
use a helper function instead of a static field to get the current
domain.

Cc: Paulo Zanoni <[email protected]>
Cc: Ville Syrjälä <[email protected]>
Cc: José Roberto de Souza <[email protected]>
Cc: Lucas De Marchi <[email protected]>
Cc: Rodrigo Vivi <[email protected]>
Signed-off-by: Imre Deak <[email protected]>
Reviewed-by: José Roberto de Souza <[email protected]>
Reviewed-by: Rodrigo Vivi <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]

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