- move all normal drivers (devices framework drivers) into drivers
folder.
- create nano folder for nano drivers
nano drivers are only for a simply wrap of the HAL function, and
not seek for adopting rt-thread devcies framework.
- provide unified nano console and GPIO drivers.
* Synchronize the code of the rt mart branch to the master branch.
* TTY device
* Add lwP code from rt-smart
* Add vnode in DFS, but DFS will be re-write for rt-smart
* There are three libcpu for rt-smart:
* arm/cortex-a, arm/aarch64
* riscv64
Co-authored-by: Rbb666 <zhangbingru@rt-thread.com>
Co-authored-by: zhkag <zhkag@foxmail.com>
Meco Man
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