* [rtdef] rename RT_WEAK attribute as rt_weak * [rtdef] rename RT_USED attribute as rt_used * [rtdef] rename RT_SECTION attribute as rt_section * [rtdef] rename ALIGN attribute as rt_align * [legacy] add RT_USED ALIGN RT_SECTION RT_WEAK as legacy support
* add core-v-mcu bsp * 规范bsp格式 添加readme * 修改readme Co-authored-by: 1516081466@qq.com <ws051000>