drm/i915: s/HAS_BAR2_SMEM_STOLEN/HAS_LMEMBAR_SMEM_STOLEN/

The fact that LMEMBAR is BAR2 should be of no real interest
to anyone. So use the name of the BAR rather than its index.

Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20221005154159.18750-3-ville.syrjala@linux.intel.com


Acked-by: Matthew Auld <matthew.auld@intel.com>