ASoC: Intel: Remove vague commit about slave DMA config from firmware loader

Intel MID DMA driver is going to be removed, commit should be a few lines
down near to dmaengine_slave_config() call in order to not confuse and at
quick look Synopsys DesignWare does seem to use some of the slave config
structure fields (see drivers/dma/dw/core.c: dwc_config()).

Signed-off-by: Jarkko Nikula <jarkko.nikula@linux.intel.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

sound/soc/intel/sst-firmware.c

@@ -221,8 +221,6 @@ int sst_dsp_dma_get_channel(struct sst_dsp *dsp, int chan_id)
 	dma_cap_mask_t mask;
 	int ret;
 
-	/* The Intel MID DMA engine driver needs the slave config set but
-	 * Synopsis DMA engine driver safely ignores the slave config */
 	dma_cap_zero(mask);
 	dma_cap_set(DMA_SLAVE, mask);
 	dma_cap_set(DMA_MEMCPY, mask);