[stm32f3discovery] Fixing typo and activating krooz imu instead of the f3discovery sensors (for now)
[stm32f3discovery] activating all LEDs and setting all the uarts correctly in f3discovery makefile
[stm32f3discovery] Fixing gpio_enable_clock for f3
[stm32f3discovery] Fixing usart irq function names
[stm32f3discovery] Fixing the spektrum uart defines, this requires a libopencm3 modification: rcc usart clock enable definitions are incomplete