The unique serial number from the device unique signature block was never used
in any examples. Add it to the these two usb midi examples, to have a user for
this api available for reference.
Be specifically careful with the usb examples. There is likely some
breakage to be expected, not sure I updated all the drivers to the
correct types for the respective chips.
This board connects the USB HS interface to the micro usb connector as
opposed to the USB FS interface on the stm32f4-discovery board. This is
why we are using different pins, different periph and different driver.
At the end it should(TM) behave the same as the HS interface implements
FS too.
