ARM: dts: stm32: Add alternate pinmux for CAN1 pins

Add another mux option for CAN1 pins, this is used on DRC Compact board.

Signed-off-by: Marek Vasut <[e-mail]>
Cc: Alexandre Torgue <[e-mail]>
Cc: [e-mail]
To: [e-mail]
Signed-off-by: Alexandre Torgue <[e-mail]>

arch/arm/boot/dts/stm32mp15-pinctrl.dtsi

···
 		};
 	};
 
+	m_can1_pins_c: m-can1-2 {
+		pins1 {
+			pinmux = <STM32_PINMUX('H', 13, AF9)>; /* CAN1_TX */
+			slew-rate = <1>;
+			drive-push-pull;
+			bias-disable;
+		};
+		pins2 {
+			pinmux = <STM32_PINMUX('H', 14, AF9)>; /* CAN1_RX */
+			bias-disable;
+		};
+	};
+
+	m_can1_sleep_pins_c: m_can1-sleep-2 {
+		pins {
+			pinmux = <STM32_PINMUX('H', 13, ANALOG)>, /* CAN1_TX */
+				 <STM32_PINMUX('H', 14, ANALOG)>; /* CAN1_RX */
+		};
+	};
+
 	m_can2_pins_a: m-can2-0 {
 		pins1 {
 			pinmux = <STM32_PINMUX('B', 13, AF9)>; /* CAN2_TX */