arm64: dts: marvell: armada-37xx: add SPI CS1 pinctrl

This adds pinctrl node for the GPIO to be used as SPI chip select 1.
Signed-off-by: NMarek Behún <marek.behun@nic.cz>
Cc: Gregory CLEMENT <gregory.clement@bootlin.com>
Signed-off-by: NGregory CLEMENT <gregory.clement@bootlin.com>

arch/arm64/boot/dts/marvell/armada-37xx.dtsi

@@ -215,6 +215,11 @@
 					function = "spi";
 				};
 
+				spi_cs1_pins: spi-cs1-pins {
+					groups = "spi_cs1";
+					function = "spi";
+				};
+
 				i2c1_pins: i2c1-pins {
 					groups = "i2c1";
 					function = "i2c";