arm64: dts: imx8-ss-lsio: Remove unused clock

The lsio_mem_clk is not used anywhere, so simply remove it.
Signed-off-by: Fabio Estevam <festevam@denx.de>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>

arch/arm64/boot/dts/freescale/imx8-ss-lsio.dtsi

@@ -14,13 +14,6 @@ lsio_subsys: bus@5d000000 {
 	ranges = <0x5d000000 0x0 0x5d000000 0x1000000>,
 		 <0x08000000 0x0 0x08000000 0x10000000>;
 
-	lsio_mem_clk: clock-lsio-mem {
-		compatible = "fixed-clock";
-		#clock-cells = <0>;
-		clock-frequency = <200000000>;
-		clock-output-names = "lsio_mem_clk";
-	};
-
 	lsio_bus_clk: clock-lsio-bus {
 		compatible = "fixed-clock";
 		#clock-cells = <0>;