ASoC: bcm: add depends on HAS_DMA

add depends on HAS_DMA to Kconfig.  This fixes error reported
by kbuild test robot when building for ARCH=m32r:
ERROR: "bad_dma_ops" [sound/soc/bcm/snd-soc-cygnus.ko] undefined!
Signed-off-by: NScott Branden <scott.branden@broadcom.com>
Signed-off-by: NMark Brown <broonie@kernel.org>

sound/soc/bcm/Kconfig

@@ -11,6 +11,7 @@ config SND_BCM2835_SOC_I2S
 config SND_SOC_CYGNUS
 	tristate "SoC platform audio for Broadcom Cygnus chips"
 	depends on ARCH_BCM_CYGNUS || COMPILE_TEST
+	depends on HAS_DMA
 	help
 	  Say Y if you want to add support for ASoC audio on Broadcom
 	  Cygnus chips (bcm958300, bcm958305, bcm911360)