riscv: dts: canaan: use custom compatible for k210 i2s

The devicetrees using the Canaan k210 all have a sound-dai-cells value
of 1, whereas the standard binding example for the DesignWare i2s and
other use cases suggest 0. Use a k210 specific compatible which
supports this difference.
Signed-off-by: Conor Dooley <conor.dooley@microchip.com>
Link: https://lore.kernel.org/r/20220705215213.1802496-10-mail@conchuod.ieSigned-off-by: Palmer Dabbelt <palmer@rivosinc.com>

arch/riscv/boot/dts/canaan/k210.dtsi

@@ -251,7 +251,7 @@ spi2: spi@50240000 {
 			};
 
 			i2s0: i2s@50250000 {
-				compatible = "snps,designware-i2s";
+				compatible = "canaan,k210-i2s", "snps,designware-i2s";
 				reg = <0x50250000 0x200>;
 				interrupts = <5>;
 				clocks = <&sysclk K210_CLK_I2S0>;
@@ -260,7 +260,7 @@ i2s0: i2s@50250000 {
 			};
 
 			i2s1: i2s@50260000 {
-				compatible = "snps,designware-i2s";
+				compatible = "canaan,k210-i2s", "snps,designware-i2s";
 				reg = <0x50260000 0x200>;
 				interrupts = <6>;
 				clocks = <&sysclk K210_CLK_I2S1>;
@@ -269,7 +269,7 @@ i2s1: i2s@50260000 {
 			};
 
 			i2s2: i2s@50270000 {
-				compatible = "snps,designware-i2s";
+				compatible = "canaan,k210-i2s", "snps,designware-i2s";
 				reg = <0x50270000 0x200>;
 				interrupts = <7>;
 				clocks = <&sysclk K210_CLK_I2S2>;