ASoC: spacemit: use `depends on` instead of `select`

ASoC: spacemit: use `depends on` instead of `select`

Selecting DMA_CMA directly bypasses its dependency chain.
This can cause build warnings or errors if the required
dependencies are not enabled.

Reported-by: Stephen Rothwell <sfr@canb.auug.org.au>
Closes: https://lore.kernel.org/all/20251022141705.714b19b5@canb.auug.org.au/
Fixes: fce217449075 ("ASoC: spacemit: add i2s support for K1 SoC")
Signed-off-by: Troy Mitchell <troy.mitchell@linux.spacemit.com>
Link: https://patch.msgid.link/20251028-fix-k1-i2s-v2-2-a547c15ed5c3@linux.spacemit.com
Signed-off-by: Mark Brown <broonie@kernel.org>