mmc: uniphier-sd: sync with Linux

Sync with the driver code and the binding recently merged in Linux.

Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
diff --git a/arch/arm/dts/uniphier-ld20.dtsi b/arch/arm/dts/uniphier-ld20.dtsi
index 35867ab..9970497 100644
--- a/arch/arm/dts/uniphier-ld20.dtsi
+++ b/arch/arm/dts/uniphier-ld20.dtsi
@@ -529,7 +529,7 @@
 		};
 
 		sd: sdhc@5a400000 {
-			compatible = "socionext,uniphier-sdhc";
+			compatible = "socionext,uniphier-sd-v3.1.1";
 			status = "disabled";
 			reg = <0x5a400000 0x800>;
 			interrupts = <0 76 4>;