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.
Remove the ISR function and remains of the hack in lcd-spi.c and
convert console.c to use the LOC3 system reset code rather than
the hack which only works on the F4 as it turns out.
Now that I know a bit more about how SPI is working on the STM32F4
I removed the egregious hack and replaced it with some cleaner code
for driving the LCD. On the positive side it gets a faster update
rate on the screen.
