ARM: dts: stm32: add spdfirx pins to stm32mp157c

This patch adds spdifrx support on stm32mp157c eval board.
Signed-off-by: Olivier Moysan <olivier.moysan@st.com>
Signed-off-by: Alexandre Torgue <alexandre.torgue@st.com>

arch/arm/boot/dts/stm32mp157-pinctrl.dtsi

@@ -393,6 +393,19 @@ pins {
 				};
 			};
 
+			spdifrx_pins_a: spdifrx-0 {
+				pins {
+					pinmux = <STM32_PINMUX('G', 12, AF8)>; /* SPDIF_IN1 */
+					bias-disable;
+				};
+			};
+
+			spdifrx_sleep_pins_a: spdifrx-1 {
+				pins {
+					pinmux = <STM32_PINMUX('G', 12, ANALOG)>; /* SPDIF_IN1 */
+				};
+			};
+
 			uart4_pins_a: uart4-0 {
 				pins1 {
 					pinmux = <STM32_PINMUX('G', 11, AF6)>; /* UART4_TX */