drm/i915: Remove ad-hoc lmem/stolen debugs

Now that intel_memory_regions_hw_probe() prints out each and every
memory region there's no reason to have ad-hoc debugs to do similar
things elsewhere.

Reviewed-by: Andrzej Hajda <andrzej.hajda@intel.com>
Reviewed-by: Nirmoy Das <nirmoy.das@intel.com>
Tested-by: Paz Zcharya <pazz@chromium.org>
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20240202224340.30647-4-ville.syrjala@linux.intel.com