RT-Thread/rt-thread: https://github.com/RT-Thread/rt-thread.git @ 2fcdb0c09ca2b9f9a75092291eebda2eee4f2f4e

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David Lin 011ed26bac [bsp/hifive1]Fixed symbol error in interrupt.c		6 lat temu
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SConscript	43922e465e [bsp] add new bsp: hifive1	7 lat temu
board.c	99cbadc1d9 [bsp][hifive1] remove unused code	7 lat temu
board.h	43922e465e [bsp] add new bsp: hifive1	7 lat temu
drv_usart.c	43922e465e [bsp] add new bsp: hifive1	7 lat temu
interrupt.c	011ed26bac [bsp/hifive1]Fixed symbol error in interrupt.c	6 lat temu
interrupt.h	fedc573768 [bsp/hifive1]rt_hw_interrupt_install函数name参数增加const限定	7 lat temu