ASoC: Remove unused function declaration in imx-ssi.h

These functions are removed in commit f0fba2ad
"ASoC: multi-component - ASoC Multi-Component Support".
Let's remove the leftover function declaration in header file.
Signed-off-by: Axel Lin <axel.lin@gmail.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>

sound/soc/imx/imx-ssi.h

@@ -218,12 +218,6 @@ struct imx_ssi {
 	struct platform_device *soc_platform_pdev_fiq;
 };
 
-struct snd_soc_platform *imx_ssi_fiq_init(struct platform_device *pdev,
-		struct imx_ssi *ssi);
-void imx_ssi_fiq_exit(struct platform_device *pdev, struct imx_ssi *ssi);
-struct snd_soc_platform *imx_ssi_dma_mx2_init(struct platform_device *pdev,
-		struct imx_ssi *ssi);
-
 int snd_imx_pcm_mmap(struct snd_pcm_substream *substream, struct vm_area_struct *vma);
 int imx_pcm_new(struct snd_soc_pcm_runtime *rtd);
 void imx_pcm_free(struct snd_pcm *pcm);