ARM: dts: ti: Fix pca954x i2c-mux node names

"make dtbs_check":

arch/arm/boot/dts/am3874-iceboard.dtb: pca9548@70: $nodename:0: 'pca9548@70' does not match '^(i2c-?)?mux'
From schema: Documentation/devicetree/bindings/i2c/i2c-mux-pca954x.yaml
arch/arm/boot/dts/am3874-iceboard.dtb: pca9548@70: Unevaluated properties are not allowed ('#address-cells', '#size-cells', 'i2c@0', 'i2c@1', 'i2c@2', 'i2c@3', 'i2c@4', 'i2c@5', 'i2c@6', 'i2c@7' were unexpected)
From schema: Documentation/devicetree/bindings/i2c/i2c-mux-pca954x.yaml
...

Fix this by renaming PCA954x nodes to "i2c-mux", to match the I2C bus
multiplexer/switch DT bindings and the Generic Names Recommendation in
the Devicetree Specification.

Signed-off-by: Geert Uytterhoeven <[e-mail]>
Message-Id: <bc964[e-mail]>
Signed-off-by: Tony Lindgren <[e-mail]>

arch/arm/boot/dts/am3874-iceboard.dts

···
 	 * "i2c-mux-idle-disconnect" is important.
 	 */
 
-	pca9548@70 {
+	i2c-mux@70 {
 		compatible = "nxp,pca9548";
 		reg = <0x70>;
 		#address-cells = <1>;
···
 };
 
 &i2c2 {
-	pca9548@71 {
+	i2c-mux@71 {
 		compatible = "nxp,pca9548";
 		reg = <0x71>;
 		#address-cells = <1>;