uboot-envtools: ath79: remove env config for Senao Loader devices

uboot-envtools can automatically parse the 'u-boot,env' compatible string from the dts.

Signed-off-by: Kevin Abraham <kevin@westhousefarm.com>

target/linux/ath79/dts/qca955x_senao_loader.dtsi

@@ -59,6 +59,7 @@
 			};
 
 			partition@40000 {
+				compatible = "u-boot,env";
 				label = "u-boot-env";
 				reg = <0x040000 0x010000>;
 			};