- make _hw_endpoint_xfer_sync and _hw_endpoint_start_next_buffer private
- drop prefix _ from _hw_endpoint_xfer_continue and
_hw_endpoint_reset_transfer
* Add MM32 SDK and USB driver
* add mindmotion mm32sdk as submodule
remove the local copy of mm32
* mit license
Signed-off-by: zhangslice <[email protected]>
Co-authored-by: hathach <[email protected]>