stmhal/boards: For STM32F411DISC, change I2C pin according to datasheet.

The pin had to be changed to get the I2C sensors on board to work.

stmhal/boards/STM32F411DISC/mpconfigboard.h

@@ -35,7 +35,7 @@
 
 // I2C busses
 #define MICROPY_HW_I2C1_SCL (pin_B6)
-#define MICROPY_HW_I2C1_SDA (pin_B7)
+#define MICROPY_HW_I2C1_SDA (pin_B9)
 //#define MICROPY_HW_I2C2_SCL (pin_B10)
 //#define MICROPY_HW_I2C2_SDA (pin_B11)
 #define MICROPY_HW_I2C3_SCL (pin_A8)