drm/i915/psr: Allow PSR with sprite enabled on hsw/bdw

Can't see why we'd want the sprite blocking PSR entry.
Mask it out.

Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20230609141404.12729-13-ville.syrjala@linux.intel.com


Reviewed-by: Jouni Högander <jouni.hogander@intel.com>