drm/i915/psr: Fix BDW PSR AUX CH data register offsets

drm/i915/psr: Fix BDW PSR AUX CH data register offsets

The multiplication got replaced by an addition in some cleanup.
This means we never write the correct data to some of the BDW
PSR data registers and thus we fail to actually wake up the
panel from PSR.

Fixes: 4ab4fa103217 ("drm/i915/psr: Make PSR registers relative to transcoders")
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20230609141404.12729-3-ville.syrjala@linux.intel.com
Reviewed-by: Jouni Högander <jouni.hogander@intel.com>
(cherry picked from commit 460dc4ba1442b3e5e543328d11db2702b98d3d7c)
Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>