ARM: dts: stm32: add pwm sleep pins to stm32mp157c-ev1

Add pinctrl sleep state for PWM on stm32mp157c-ev1 board.
Signed-off-by: Fabrice Gasnier <fabrice.gasnier@st.com>
Signed-off-by: Alexandre Torgue <alexandre.torgue@st.com>

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

@@ -296,7 +296,8 @@ &timers2 {
 	status = "disabled";
 	pwm {
 		pinctrl-0 = <&pwm2_pins_a>;
-		pinctrl-names = "default";
+		pinctrl-1 = <&pwm2_sleep_pins_a>;
+		pinctrl-names = "default", "sleep";
 		status = "okay";
 	};
 	timer@1 {
@@ -310,7 +311,8 @@ &timers8 {
 	status = "disabled";
 	pwm {
 		pinctrl-0 = <&pwm8_pins_a>;
-		pinctrl-names = "default";
+		pinctrl-1 = <&pwm8_sleep_pins_a>;
+		pinctrl-names = "default", "sleep";
 		status = "okay";
 	};
 	timer@7 {
@@ -324,7 +326,8 @@ &timers12 {
 	status = "disabled";
 	pwm {
 		pinctrl-0 = <&pwm12_pins_a>;
-		pinctrl-names = "default";
+		pinctrl-1 = <&pwm12_sleep_pins_a>;
+		pinctrl-names = "default", "sleep";
 		status = "okay";
 	};
 	timer@11 {