ASoC: amd: acp: clear pdm dma interrupt mask

Clear pdm dma interrupt mask in acp_dmic_shutdown().

'Fixes: c32bd332

 ("ASoC: amd: acp: Add generic support for
PDM controller on ACP")'

Signed-off-by: Syed Saba Kareem <Syed.SabaKareem@amd.com>
Link: https://lore.kernel.org/r/Message-Id

: <20230622152406.3709231-1-Syed.SabaKareem@amd.com>
Signed-off-by: Mark Brown <broonie@kernel.org>