ARM: dts: lan966x: rename pinctrl nodes

The pinctrl device tree binding will be converted to YAML format. Rename
the pin nodes so they end with "-pins" to match the schema.
Signed-off-by: Michael Walle <michael@walle.cc>
Signed-off-by: Claudiu Beznea <claudiu.beznea@microchip.com>
Link: https://lore.kernel.org/r/20220420194230.3415663-1-michael@walle.ccSigned-off-by: Nicolas Ferre <nicolas.ferre@microchip.com>

arch/arm/boot/dts/lan966x-pcb8291.dts

@@ -35,7 +35,7 @@ fc3_b_pins: fcb3-spi-pins {
 		function = "fc3_b";
 	};
 
-	can0_b_pins:  can0_b_pins {
+	can0_b_pins:  can0-b-pins {
 		/* RX, TX */
 		pins = "GPIO_35", "GPIO_36";
 		function = "can0_b";