changes coremark build system to use BSP

benchmarks/dhrystone/dhry_stubs.c

@@ -1,4 +1,7 @@
 #include "platform.h"
+#ifndef ITERATIONS
+#define ITERATIONS 20000
+#endif
 
 /* The functions in this file are only meant to support Dhrystone on an
  * embedded RV32 system and are obviously incorrect in general. */
@@ -11,7 +14,7 @@ long time(void)
 // set the number of dhrystone iterations
 void __wrap_scanf(const char* fmt, int* n)
 {
-  *n = 20000;
+  *n = ITERATIONS;
 }
 
 extern volatile uint32_t tohost;