ARM: dts: ls1021a: add "fsl,ls1021a-esdhc" compatible string to esdhc node

Commit a22950c8 (mmc: sdhci-of-esdhc: add quirk
SDHCI_QUIRK_BROKEN_TIMEOUT_VAL for ls1021a) added logic to the driver to
enable the broken timeout val quirk for ls1021a, but did not add the
corresponding compatible string to the device tree, so it didn't really
have any effect. Fix that.
Signed-off-by: NRasmus Villemoes <rasmus.villemoes@prevas.dk>
Signed-off-by: NShawn Guo <shawnguo@kernel.org>

arch/arm/boot/dts/ls1021a.dtsi

@@ -169,7 +169,7 @@
 		};
 
 		esdhc: esdhc@1560000 {
-			compatible = "fsl,esdhc";
+			compatible = "fsl,ls1021a-esdhc", "fsl,esdhc";
 			reg = <0x0 0x1560000 0x0 0x10000>;
 			interrupts = <GIC_SPI 94 IRQ_TYPE_LEVEL_HIGH>;
 			clock-frequency = <0>;