stm32-f4discovery-usb: added i2s pll tables and samplerate compensation support
stm32-f4discovery-cc256xx: dokumentation and some cleanups

stm32-f4discovery-cc256x: added hint regarding _printf_float
stm32-f4discovery-cc256x: added bsp api to fetch the actual sampling rate
stm32-f4discovery-cc256x: switched clock source to HSE instead o

stm32-f4discovery-cc256x: added hint regarding _printf_float
stm32-f4discovery-cc256x: added bsp api to fetch the actual sampling rate
stm32-f4discovery-cc256x: switched clock source to HSE instead of HSI
stm32-f4discovery-cc256x: fixed wrong i2spll parameters

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stm32-f4discovery-cc256x: use new Makefile-based port