opta: swap i2c1 and i2c3 to restore compatibility with mbed cores

With mbed core
Wire uses PH_7 PH_8 pins connected to the expansion bus
Wire 1 uses PB_6 PB_7 pins connected to the crypto

Signed-off-by: pennam <[email protected]>

Author: pennam

variants/arduino_opta_stm32h747xx_m7/arduino_opta_stm32h747xx_m7.overlay

@@ -101,7 +101,7 @@
 
 		serials = <&board_cdc_acm_uart>, <&usart3>, <&usart6>;
 		cdc-acm = <&board_cdc_acm_uart>;
-		i2cs = <&i2c1>, <&i2c3>;
+		i2cs = <&i2c3>, <&i2c1>;
 
 		io-channels =	<&adc1 0>,
 				<&adc3 0>,