ASoC: fix compile breakage if CONFIG_SH_DMA_API=y && CONFIG_SND_SIU_MIGOR!=n

Audio on Migo-R cannot work if CONFIG_SH_DMA_API=y, but compilation should not
break anyway.
Signed-off-by: Guennadi Liakhovetski <g.liakhovetski@gmx.de>
Acked-by: Liam Girdwood <lrg@slimlogic.co.uk>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>

sound/soc/sh/Kconfig

@@ -29,6 +29,7 @@ config SND_SOC_SH4_FSI
 config SND_SOC_SH4_SIU
 	tristate
 	depends on (SUPERH || ARCH_SHMOBILE) && HAVE_CLK
+	select DMA_ENGINE
 	select DMADEVICES
 	select SH_DMAE