ARM: dts: stm32: add spi1 sleep state pinctrl on stm32mp157c-ev1

Add the sleep state of the spi1 instance on stm32mp157c-ev1.

Signed-off-by: Alain Volmat <alain.volmat@foss.st.com>
Link: https://lore.kernel.org/r/20251218-stm32-spi-enhancements-v2-4-3b69901ca9fe@foss.st.com
Signed-off-by: Alexandre Torgue <alexandre.torgue@foss.st.com>

Author: Alain Volmat

arch/arm/boot/dts/st/stm32mp157c-ev1.dts

@@ -296,8 +296,9 @@
 };
 
 &spi1 {
-	pinctrl-names = "default";
+	pinctrl-names = "default", "sleep";
 	pinctrl-0 = <&spi1_pins_a>;
+	pinctrl-1 = <&spi1_sleep_pins_a>;
 	status = "disabled";
 };