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: NLaxman Dewangan <ldewangan@nvidia.com>
Signed-off-by: NStephen Warren <swarren@nvidia.com>
Acked-by: NMark Brown <broonie@opensource.wolfsonmicro.com>