ALSA: hda: Use non-SG allocation for the communication buffers

The azx_bus->dma_type is referred only for allocating the
communication buffers like CORB/RIRB, and the allocation size is
small.  Hence it doesn't have to be S/G buffer allocation, which is an
obvious overkill.  Use the standard SNDRV_DMA_TYPE_DEV_WC instead.

This was changed to SNDRV_DMA_TYPE_DEV_WC_SG in the commit
37137ec26c2c ("ALSA: hda: Once again fix regression of page
allocations with IOMMU") as a workaround for IOMMU-backed
allocations.  But this is no longer needed since the allocation with
SNDRV_DMA_TYPE_DEV_WC itself was fixed in the commit 9c27301342a5
("ALSA: memalloc: Use DMA API for x86 WC page allocations, too").

So this patch reverts the previous workaround in this piece of code.

Link: https://patch.msgid.link/20240909134744.25426-1-tiwai@suse.de
Signed-off-by: Takashi Iwai <tiwai@suse.de>

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