6369e89502
* [posix] POSIX standard implementation for PSE51 - add some posix's interfaces that we haven't before. - these PR have passed the interface definition test across gcc platfrom; - have tested base on qemu-a9 and stm32h750-art-pi. * [newlib] only enable POSIX.1-1990 * update projects
1. M4 run on flash bank A. M0 run on flash bank B and the binary code of M0 is embedded into the code of M4. 3. Compile the project in M0/ first and then compile the project in M4/. Then flash it into the chip with JLink.