[stm32 i2c] i2c library & includes for stm32f4xx
[stm32 i2c] add GPIO pin mode AF with open drain
[stm32 i2c] initial i2c support
[stm32 i2c] initial support on stm32f407xx. onyl one i2c port for now
[stm32] fix stm32f4discovery burn command
[ssd1306 lcd] hookup information for stm32f4discovery