Renamed MIPS test to be a single cycle test

tests/tests.sv

@@ -4,4 +4,4 @@
 `include "tests/instruction_classifier_tb.sv"
 `include "tests/shifter_tb.sv"
 `include "tests/alu_tb.sv"
-`include "tests/mips.sv"
+`include "tests/mips_singlecycle.sv"