Move the definition of the usb endpoint sizes from usb_cdc.h to
usb_cdc_ep.h . This allows individual boards to override the default
endpoint sizes.
Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
It's common for boards to have restrictions on the type of each
endpoint. So, make it possible for the board to select the endpoint
ids for each endpoint.
Signed-off-by: Kevin O'Connor <kevin@koconnor.net>