arm64: dts: ti: k3-j721e: Convert serdes_ln_ctrl node into reg-mux

This removes a dependency on the parent node being a syscon node.
Convert from mmio-mux to reg-mux adjusting node name and properties
as needed.
Signed-off-by: Andrew Davis <afd@ti.com>
Link: https://lore.kernel.org/r/20240124184722.150615-5-afd@ti.comSigned-off-by: Vignesh Raghavendra <vigneshr@ti.com>

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

@@ -45,15 +45,15 @@ scm_conf: scm-conf@100000 {
 		ranges = <0x0 0x0 0x00100000 0x1c000>;
 
 		serdes_ln_ctrl: mux-controller@4080 {
-			compatible = "mmio-mux";
-			reg = <0x00004080 0x50>;
+			compatible = "reg-mux";
+			reg = <0x4080 0x50>;
 			#mux-control-cells = <1>;
-			mux-reg-masks = <0x4080 0x3>, <0x4084 0x3>, /* SERDES0 lane0/1 select */
-					<0x4090 0x3>, <0x4094 0x3>, /* SERDES1 lane0/1 select */
-					<0x40a0 0x3>, <0x40a4 0x3>, /* SERDES2 lane0/1 select */
-					<0x40b0 0x3>, <0x40b4 0x3>, /* SERDES3 lane0/1 select */
-					<0x40c0 0x3>, <0x40c4 0x3>, <0x40c8 0x3>, <0x40cc 0x3>;
-					/* SERDES4 lane0/1/2/3 select */
+			mux-reg-masks = <0x0 0x3>, <0x4 0x3>, /* SERDES0 lane0/1 select */
+					<0x10 0x3>, <0x14 0x3>, /* SERDES1 lane0/1 select */
+					<0x20 0x3>, <0x24 0x3>, /* SERDES2 lane0/1 select */
+					<0x30 0x3>, <0x34 0x3>, /* SERDES3 lane0/1 select */
+					<0x40 0x3>, <0x44 0x3>, /* SERDES4 lane0/1 select */
+					<0x48 0x3>, <0x4c 0x3>; /* SERDES4 lane2/3 select */
 			idle-states = <J721E_SERDES0_LANE0_PCIE0_LANE0>, <J721E_SERDES0_LANE1_PCIE0_LANE1>,
 				      <J721E_SERDES1_LANE0_PCIE1_LANE0>, <J721E_SERDES1_LANE1_PCIE1_LANE1>,
 				      <J721E_SERDES2_LANE0_PCIE2_LANE0>, <J721E_SERDES2_LANE1_PCIE2_LANE1>,