i915: Implement __DRI_IMAGE_ATTRIB_OFFSET query

DRI3 needs __DRI_IMAGE_ATTRIB_OFFSET so implement it.

Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Reviewed-by: Adam Jackson <ajax@redhat.com>
Reviewed-by: Emil Velikov <emil.l.velikov@gmail.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/9734>

src/mesa/drivers/dri/i915/intel_screen.c

@@ -495,7 +495,10 @@ intel_query_image(__DRIimage *image, int attrib, int *value)
       return true;
    case __DRI_IMAGE_ATTRIB_FD:
       return !drm_intel_bo_gem_export_to_prime(image->region->bo, value);
-  default:
+   case __DRI_IMAGE_ATTRIB_OFFSET:
+      *value = image->offset;
+      return true;
+   default:
       return false;
    }
 }