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

Add SPICC Controller pin nodes for CLK line when idle for Amlogic GXBB
SoCs.

Signed-off-by: Amjad Ouled-Ameur <aouledameur@baylibre.com>
Reviewed-by: Neil Armstrong <neil.armstrong@linaro.org>
Reviewed-by: Martin Blumenstingl <martin.blumenstingl@googlemail.com>
Link: https://lore.kernel.org/r/20221004-up-aml-fix-spi-v4-4-0342d8e10c49@baylibre.com


Signed-off-by: Neil Armstrong <neil.armstrong@linaro.org>