arm64: dts: imx8mm-verdin: update CAN clock to 40MHz

Update SPI CAN controller clock to match current hardware design.
Signed-off-by: Andrejs Cainikovs <andrejs.cainikovs@toradex.com>
Acked-by: Marcel Ziswiler <marcel.ziswiler@toradex.com>
Fixes: 6a57f224 ("arm64: dts: freescale: add initial support for verdin imx8m mini")
Signed-off-by: Shawn Guo <shawnguo@kernel.org>

arch/arm64/boot/dts/freescale/imx8mm-verdin.dtsi

@@ -32,10 +32,10 @@ backlight: backlight {
 	};
 
 	/* Fixed clock dedicated to SPI CAN controller */
-	clk20m: oscillator {
+	clk40m: oscillator {
 		compatible = "fixed-clock";
 		#clock-cells = <0>;
-		clock-frequency = <20000000>;
+		clock-frequency = <40000000>;
 	};
 
 	gpio-keys {
@@ -202,7 +202,7 @@ &ecspi3 {
 
 	can1: can@0 {
 		compatible = "microchip,mcp251xfd";
-		clocks = <&clk20m>;
+		clocks = <&clk40m>;
 		interrupts-extended = <&gpio1 6 IRQ_TYPE_EDGE_FALLING>;
 		pinctrl-names = "default";
 		pinctrl-0 = <&pinctrl_can1_int>;