arm: imx: Add esdhc3/4 nodes to imx53.dtsi

These nodes are required by mx53ppd when built with CONFIG_DM_MMC=y.
They are copied from Linux 4.20.5.

Signed-off-by: Ian Ray <ian.ray@ge.com>
diff --git a/arch/arm/dts/imx53.dtsi b/arch/arm/dts/imx53.dtsi
index e13009c..0fd4acc 100644
--- a/arch/arm/dts/imx53.dtsi
+++ b/arch/arm/dts/imx53.dtsi
@@ -33,6 +33,8 @@
 		i2c2 = &i2c3;
 		mmc0 = &esdhc1;
 		mmc1 = &esdhc2;
+		mmc2 = &esdhc3;
+		mmc3 = &esdhc4;
 	};
 
 	tzic: tz-interrupt-controller@fffc000 {
@@ -86,6 +88,30 @@
 					bus-width = <4>;
 					status = "disabled";
 				};
+
+				esdhc3: esdhc@50020000 {
+					compatible = "fsl,imx53-esdhc";
+					reg = <0x50020000 0x4000>;
+					interrupts = <3>;
+					clocks = <&clks IMX5_CLK_ESDHC3_IPG_GATE>,
+						 <&clks IMX5_CLK_DUMMY>,
+						 <&clks IMX5_CLK_ESDHC3_PER_GATE>;
+					clock-names = "ipg", "ahb", "per";
+					bus-width = <4>;
+					status = "disabled";
+				};
+
+				esdhc4: esdhc@50024000 {
+					compatible = "fsl,imx53-esdhc";
+					reg = <0x50024000 0x4000>;
+					interrupts = <4>;
+					clocks = <&clks IMX5_CLK_ESDHC4_IPG_GATE>,
+						 <&clks IMX5_CLK_DUMMY>,
+						 <&clks IMX5_CLK_ESDHC4_PER_GATE>;
+					clock-names = "ipg", "ahb", "per";
+					bus-width = <4>;
+					status = "disabled";
+				};
 			};
 
 			iomuxc: iomuxc@53fa8000 {