iris: Re-emit Surface State Base Address when context is lost.

When we hit a GPU hang, we failed to reset Surface State Base Address
right away, and would keep hanging until we filled up the binder.  Then
we'd finally get it right after a lot of repeated stumbles.  Update it
right away so we hopefully hang fewer times before succeeding.

src/gallium/drivers/iris/iris_context.c

@@ -99,6 +99,7 @@ iris_lost_context_state(struct iris_batch *batch)
 
    ice->state.dirty = ~0ull;
    memset(ice->state.last_grid, 0, sizeof(ice->state.last_grid));
+   batch->last_surface_base_address = ~0ull;
 }
 
 static enum pipe_reset_status