arm64: dts: ti: j721e-main: Fix 'dtbs_check' in serdes_ln_ctrl node

Fix 'dtbs_check' in serdes_ln_ctrl (mux@4080) node by changing the node
name to mux-controller@4080.
Signed-off-by: NKishon Vijay Abraham I <kishon@ti.com>
Reviewed-by: NAswath Govindraju <a-govindraju@ti.com>
Signed-off-by: NVignesh Raghavendra <vigneshr@ti.com>
Link: https://lore.kernel.org/r/20211126084555.17797-3-kishon@ti.com

arch/arm64/boot/dts/ti/k3-j721e-main.dtsi

@@ -42,7 +42,7 @@
 		#size-cells = <1>;
 		ranges = <0x0 0x0 0x00100000 0x1c000>;
 
-		serdes_ln_ctrl: mux@4080 {
+		serdes_ln_ctrl: mux-controller@4080 {
 			compatible = "mmio-mux";
 			reg = <0x00004080 0x50>;
 			#mux-control-cells = <1>;