arm64: renesas: salvator-x: Sound SSI DMA support

DMA transfer to/from SSI

     DMA
[MEM] -> [SSI]

     DMA
[MEM] <- [SSI]
Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>

arch/arm64/boot/dts/renesas/r8a7795-salvator-x.dts

@@ -143,11 +143,11 @@ dai0 {
 };
 
 &ssi0 {
-	pio-transfer;
+	no-busif;
 };
 
 &ssi1 {
-	pio-transfer;
+	no-busif;
 	shared-pin;
 };