ARM: dts: stm32: Add alternate pinmux for I2C2 pins

Add another mux option for I2C2 pins, this is used on AV96 board.
Signed-off-by: Marek Vasut <marex@denx.de>
Cc: Alexandre Torgue <alexandre.torgue@st.com>
Cc: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
Cc: Maxime Coquelin <mcoquelin.stm32@gmail.com>
Cc: Patrice Chotard <patrice.chotard@st.com>
Cc: Patrick Delaunay <patrick.delaunay@st.com>
Cc: linux-stm32@st-md-mailman.stormreply.com
To: linux-arm-kernel@lists.infradead.org
Signed-off-by: Alexandre Torgue <alexandre.torgue@st.com>

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

@@ -408,6 +408,23 @@ pins {
 		};
 	};
 
+	i2c2_pins_c: i2c2-2 {
+		pins {
+			pinmux = <STM32_PINMUX('F', 1, AF4)>, /* I2C2_SCL */
+				 <STM32_PINMUX('H', 5, AF4)>; /* I2C2_SDA */
+			bias-disable;
+			drive-open-drain;
+			slew-rate = <0>;
+		};
+	};
+
+	i2c2_pins_sleep_c: i2c2-sleep-2 {
+		pins {
+			pinmux = <STM32_PINMUX('F', 1, ANALOG)>, /* I2C2_SCL */
+				 <STM32_PINMUX('H', 5, ANALOG)>; /* I2C2_SDA */
+		};
+	};
+
 	i2c5_pins_a: i2c5-0 {
 		pins {
 			pinmux = <STM32_PINMUX('A', 11, AF4)>, /* I2C5_SCL */