[bsp][redv] change header file reference

bsp/sparkfun-redv/freedom-e-sdk/bsp/env/freedom-e300-hifive1/init.c

@@ -4,7 +4,7 @@
 
 #include "platform.h"
 #include "encoding.h"
-#include "rtthread.h"
+#include <rtthread.h>
 
 extern int main(int argc, char** argv);
 extern void trap_entry();