Remove undocumented big-endian, there are already define little-endian at
binding doc.

Fix below CHECK_DTB warning:
arch/arm/boot/dts/nxp/ls/ls1021a-iot.dtb: esdhc@1560000 (fsl,ls1021a-esdhc): Unevaluated properties are not allowed ('big-endian', 'bus-width', 'compatible' were unexpected)

Signed-off-by: Frank Li <Frank.Li@nxp.com>
---
 arch/arm/boot/dts/nxp/ls/ls1021a.dtsi | 1 -
 1 file changed, 1 deletion(-)

diff --git a/arch/arm/boot/dts/nxp/ls/ls1021a.dtsi b/arch/arm/boot/dts/nxp/ls/ls1021a.dtsi
index e16f7f2e3878372f3e622c57705cdbe9f5c7d15b..444fa5e2d42cc8f0ad81efded818b4420683622b 100644
--- a/arch/arm/boot/dts/nxp/ls/ls1021a.dtsi
+++ b/arch/arm/boot/dts/nxp/ls/ls1021a.dtsi
@@ -161,7 +161,6 @@ esdhc: mmc@1560000 {
 			clock-frequency = <0>;
 			voltage-ranges = <1800 1800 3300 3300>;
 			sdhci,auto-cmd12;
-			big-endian;
 			bus-width = <4>;
 			status = "disabled";
 		};

-- 
2.34.1