board: intel_adsp_ace15_mtpm: Drop CONFIG_DMA_DW_SUSPEND_DRAIN

The purpose of CONFIG_DMA_DW_SUSPEND_DRAIN is to empty the FIFO before
disabling the channel by draining it.
Since the peripheral is disabled before the DMA
(CONFIG_COMP_DAI_STOP_TRIGGER_ORDER_REVERSE is not selected), the DMA will
not be able to do that causing drain timeout.

The stop is used in two cases:
Stream stop:
the content of the FIFO does not matter as we stop the stream.

Pause/resume:
On pause the DMA is suspended (DW_CFGL_SUSPEND bit set)
On resume the DMA is stopped, re-configured and then started again instead
of resuming

The peripheral is started after the DMA stop and start.

Leftover audio data might cause audio glitch on resume, it is probably
better to disable the draining.

Note: if we want to have draining enabled we need to select the
CONFIG_COMP_DAI_STOP_TRIGGER_ORDER_REVERSE at the same time to force the
DMA to be stopped before the DAI.

Signed-off-by: Peter Ujfalusi <peter.ujfalusi@linux.intel.com>

app/boards/intel_adsp_ace15_mtpm.conf

@@ -36,7 +36,6 @@ CONFIG_ZEPHYR_DP_SCHEDULER=y
 CONFIG_DMA=y
 CONFIG_DMA_INTEL_ADSP_GPDMA=y
 CONFIG_DMA_DW_LLI_POOL_SIZE=50
-CONFIG_DMA_DW_SUSPEND_DRAIN=y
 CONFIG_INTEL_MODULES=y
 CONFIG_LIBRARY_MANAGER=y
 CONFIG_LIBRARY_AUTH_SUPPORT=y