Allwinner V3s features an analog codec without LINEIN.

Split out this part, in order to prepare for the V3s analog codec.
Signed-off-by: NIcenowy Zheng <icenowy@aosc.xyz>
Acked-by: NChen-Yu Tsai <wens@csie.org>
Signed-off-by: NMark Brown <broonie@kernel.org>