include new mm test in benchmarks

Makefrag

@@ -532,7 +532,7 @@ bmarks = \
 	qsort.riscv \
 	towers.riscv \
 	vvadd.riscv \
-	dgemm.riscv \
+	mm.riscv \
 	dhrystone.riscv \
 	spmv.riscv \
 	#vec-vvadd.riscv \