drm/i915/psr: Add missing ALPM AUX-Less register definitions

Couple of ALPM AUX-Less related fields are missing from ALPM register
definitions. Add these and remove some duplicate definitions.

Bspec: 70294

V2: add Bspec reference

Signed-off-by: Jouni Högander <jouni.hogander@intel.com>
Reviewed-by: Arun R Murthy <arun.r.murthy@intel.com>
Reviewed-by: Animesh Manna <animesh.manna@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20240328141928.1311284-2-jouni.hogander@intel.com