etnaviv: fill in layer_stride for imported resources

The layer stride information is used in various parts of the driver,
so it needs to be present regardless if the driver allocated the
buffer itself or merely imported it from an external source.

Signed-off-by: Lucas Stach <l.stach@pengutronix.de>
Reviewed-by: Philipp Zabel <p.zabel@pengutronix.de>
Reviewed-by: Christian Gmeiner <christian.gmeiner@gmail.com>
Reviewed-by: Wladimir J. van der Laan <laanwj@gmail.com>

src/gallium/drivers/etnaviv/etnaviv_resource.c

@@ -352,6 +352,8 @@ etna_resource_from_handle(struct pipe_screen *pscreen,
 
    level->padded_width = align(level->width, paddingX);
    level->padded_height = align(level->height, paddingY);
+   level->layer_stride = level->stride * util_format_get_nblocksy(prsc->format,
+                                                                  level->padded_height);
 
    /* The DDX must give us a BO which conforms to our padding size.
     * The stride of the BO must be greater or equal to our padded