drm/i915/wm: Use per-device debugs in pre-ilk wm code

Switch to drm_dbg_kms() in the pre-ilk wm code so we see which
device generated the debugs. Need to plumb i915 a bit deeper
to make that happen.

Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20240208151720.7866-11-ville.syrjala@linux.intel.com


Reviewed-by: Jani Nikula <jani.nikula@intel.com>