ALSA: ASoC: Add destination and source port for DMA on OMAP1

Adds destination and source port for dma in platform driver as
required by OMAP1

Signed-off-by: Arun KS <arunks@mistralsolutions.com>
Acked-by: Jarkko Nikula <jarkko.nikula@nokia.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>