ASoC: amd: irq handler changes for ACP3x PDM dma driver

Whenever audio data equal to the PDM watermark level
are consumed, interrupt is generated.
Acknowledge the interrupt.

Signed-off-by: Vijendar Mukunda <Vijendar.Mukunda@amd.com>
Reviewed-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Link: https://lore.kernel.org/r/20200518171704.24999-7-Vijendar.Mukunda@amd.com


Signed-off-by: Mark Brown <broonie@kernel.org>