ARM: tegra: The Tegra30 SDHCI is not backwards-compatible

The SDHCI on Tegra30 is in fact not backwards-compatible with the
instantiation found on earlier SoCs. Drop the misleading compatible
string.
Signed-off-by: Thierry Reding <treding@nvidia.com>

arch/arm/boot/dts/tegra30.dtsi

@@ -856,7 +856,7 @@ tegra_i2s4: i2s@70080700 {
 	};
 
 	mmc@78000000 {
-		compatible = "nvidia,tegra30-sdhci", "nvidia,tegra20-sdhci";
+		compatible = "nvidia,tegra30-sdhci";
 		reg = <0x78000000 0x200>;
 		interrupts = <GIC_SPI 14 IRQ_TYPE_LEVEL_HIGH>;
 		clocks = <&tegra_car TEGRA30_CLK_SDMMC1>;
@@ -867,7 +867,7 @@ mmc@78000000 {
 	};
 
 	mmc@78000200 {
-		compatible = "nvidia,tegra30-sdhci", "nvidia,tegra20-sdhci";
+		compatible = "nvidia,tegra30-sdhci";
 		reg = <0x78000200 0x200>;
 		interrupts = <GIC_SPI 15 IRQ_TYPE_LEVEL_HIGH>;
 		clocks = <&tegra_car TEGRA30_CLK_SDMMC2>;
@@ -878,7 +878,7 @@ mmc@78000200 {
 	};
 
 	mmc@78000400 {
-		compatible = "nvidia,tegra30-sdhci", "nvidia,tegra20-sdhci";
+		compatible = "nvidia,tegra30-sdhci";
 		reg = <0x78000400 0x200>;
 		interrupts = <GIC_SPI 19 IRQ_TYPE_LEVEL_HIGH>;
 		clocks = <&tegra_car TEGRA30_CLK_SDMMC3>;
@@ -889,7 +889,7 @@ mmc@78000400 {
 	};
 
 	mmc@78000600 {
-		compatible = "nvidia,tegra30-sdhci", "nvidia,tegra20-sdhci";
+		compatible = "nvidia,tegra30-sdhci";
 		reg = <0x78000600 0x200>;
 		interrupts = <GIC_SPI 31 IRQ_TYPE_LEVEL_HIGH>;
 		clocks = <&tegra_car TEGRA30_CLK_SDMMC4>;