sna: Remove mark-as-cpu after gem_pread

The kernel no longer moves the read bo into the CPU domain, so remove
the last vestiges of that tracking.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>

src/sna/kgem.c

@@ -4147,8 +4147,6 @@ void kgem_buffer_read_sync(struct kgem *kgem, struct kgem_bo *_bo)
 			     bo->base.handle, (char *)bo->mem+offset,
 			     offset, length))
 			return;
-
-		kgem_bo_map__cpu(kgem, &bo->base);
 	}
 	kgem_bo_retire(kgem, &bo->base);
 }