ASoC: bcm: Remove obsoleted Kconfig dependency

CONFIG_SND_SOC_DMAENGINE_PCM was renamed to CONFIG_SND_DMAENGINE_PCM
recently.  And yet we don't have to select it since
CONFIG_SND_GENERIC_DMAENGINE_PCM selects the dependency by itself, so
just rip it off.
Signed-off-by: NTakashi Iwai <tiwai@suse.de>
Acked-by: NFlorian Meier <florian.meier@koalo.de>
Signed-off-by: NMark Brown <broonie@linaro.org>

sound/soc/bcm/Kconfig

 config SND_BCM2835_SOC_I2S
 	tristate "SoC Audio support for the Broadcom BCM2835 I2S module"
 	depends on ARCH_BCM2835 || COMPILE_TEST
-	select SND_SOC_DMAENGINE_PCM
 	select SND_SOC_GENERIC_DMAENGINE_PCM
 	select REGMAP_MMIO
 	help