Remove debug leftovers that were causing memory corruption.
Writes of 64 or more bytes from the USB host side caused memory
corruption before this commit.
I've tested it in a STM32L4 board and it is working as expected.
Correctly migrate stm32f103_usb_driver to st_usbfs_v1_driver instead of the
f107 driver.
Fixes: 976720c355
Reviewed-by: Karl Palsson <karlp@tweak.net.au>
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.
