Remove the support code which uses the legacy APB DMA driver
for accessing the I2S FIFO.
The driver will use the dmaengine based APB DMA driver for
accessing reqding/writing to I2S FIFO.
Signed-off-by: Laxman Dewangan <ldewangan@nvidia.com>
Signed-off-by: Stephen Warren <swarren@nvidia.com>
Acked-by: Mark Brown <broonie@opensource.wolfsonmicro.com>