Commit 
10df350977b1 ("ASoC: Intel: Fix Audio DSP usage when IOMMU is
enabled.") caused following regression in Baytrail SST:
baytrail-pcm-audio baytrail-pcm-audio: error: DMA alloc failed
baytrail-pcm-audio baytrail-pcm-audio: error: failed to load firmware
Fix this by calling dma_coerce_mask_and_coherent() in sst_byt_init() with
the same dma_dev device what is now used in sst_fw_new() when allocating the
DMA buffer.
Signed-off-by: Jarkko Nikula <jarkko.nikula@linux.intel.com>
Signed-off-by: Mark Brown <broonie@linaro.org>
        memcpy_toio(sst->addr.lpe + SST_BYT_MAILBOX_OFFSET,
               &pdata->fw_base, sizeof(u32));
 
-       ret = dma_coerce_mask_and_coherent(dev, DMA_BIT_MASK(32));
+       ret = dma_coerce_mask_and_coherent(sst->dma_dev, DMA_BIT_MASK(32));
        if (ret)
                return ret;