drm/i915: Remove duplicate DDI/AUX power domain mappings

The DDI and AUX domain -> power well mappings are identical for a few
platforms/power well instances, reuse the mappings of earlier platforms
for these removing the duplicate mapping of new platforms.

Signed-off-by: Imre Deak <imre.deak@intel.com>
Reviewed-by: Jouni Högander <jouni.hogander@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20220414210657.1785773-17-imre.deak@intel.com