arm64: dts: meson-gxl: add SPI pinctrl nodes for CLK

Add SPICC Controller pin nodes for CLK line when idle for Amlogic GXL
SoCs.
Signed-off-by: Neil Armstrong <narmstrong@baylibre.com>
Signed-off-by: Amjad Ouled-Ameur <aouledameur@baylibre.com>
Reviewed-by: Martin Blumenstingl <martin.blumenstingl@googlemail.com>
Link: https://lore.kernel.org/r/20221004-up-aml-fix-spi-v4-3-0342d8e10c49@baylibre.comSigned-off-by: Neil Armstrong <neil.armstrong@linaro.org>

arch/arm64/boot/dts/amlogic/meson-gxl.dtsi

@@ -429,6 +429,20 @@ mux {
 			};
 		};
 
+		spi_idle_high_pins: spi-idle-high-pins {
+			mux {
+				groups = "spi_sclk";
+				bias-pull-up;
+			};
+		};
+
+		spi_idle_low_pins: spi-idle-low-pins {
+			mux {
+				groups = "spi_sclk";
+				bias-pull-down;
+			};
+		};
+
 		spi_ss0_pins: spi-ss0 {
 			mux {
 				groups = "spi_ss0";