powerpc/85xx: Add eSDHC support for MPC8569E-MDS boards

Note that eSDHC and DUART0 are mutually exclusive on MPC8569E-MDS
boards. Default option is DUART0, so eSDHC is disabled by default.
U-Boot will fixup device tree if eSDHC should be used instead of
DUART0.
Signed-off-by: NAnton Vorontsov <avorontsov@ru.mvista.com>
Signed-off-by: NKumar Gala <galak@kernel.crashing.org>

arch/powerpc/boot/dts/mpc8569mds.dts

@@ -220,6 +220,16 @@
 			};
 		};
 
+		sdhci@2e000 {
+			compatible = "fsl,mpc8569-esdhc", "fsl,esdhc";
+			reg = <0x2e000 0x1000>;
+			interrupts = <72 0x8>;
+			interrupt-parent = <&mpic>;
+			/* Filled in by U-Boot */
+			clock-frequency = <0>;
+			status = "disabled";
+		};
+
 		crypto@30000 {
 			compatible = "fsl,sec3.1", "fsl,sec3.0", "fsl,sec2.4",
 				"fsl,sec2.2", "fsl,sec2.1", "fsl,sec2.0";