netduinop2: Allow the CPU to be passed in

Signed-off-by: Alistair Francis <alistair23@gmail.com>
stm32f405: Name and typo updates

Signed-off-by: Alistair Francis <alistair23@gmail.com>
stm32f405_adc: Disable debug printing

Signed-off-by: Alistair Francis <alistair23@gmail.com>
stm32f405_adc: Generate random values for the ADC

Signed-off-by: Alistair Francis <alistair23@gmail.com>
stm32f405_adc: Add information about injection ADC

ADC injection method is unimplemented, ensure the user is
warned about this

Signed-off-by: Alistair Francis <alistair23@gmail.com>