ASoC: loongson: Separate external shared DMA from the platform interface

The Loongson I2S platform driver (used on LS2K1000, LS7A etc.) relies on
an external DMA engine (e.g., dw_dmac) rather than the internal DMA.
However, its DMA-related code was originally embedded in
loongson_i2s_plat.c, duplicating logic that should be shared.

Extract the external DMA (eDMA) support from the platform driver and move
it into loongson_dma.c alongside the existing internal DMA (iDMA) code.

This change eliminates code duplication and prepares for future
consolidation of DMA selection logic.

Signed-off-by: Binbin Zhou <zhoubinbin@loongson.cn>
Link: https://patch.msgid.link/979368ad269f192703ed24e9a19eebce32316745.1780304703.git.zhoubinbin@loongson.cn
Signed-off-by: Mark Brown <broonie@kernel.org>

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