[Benchmark] Add microbenchmarks for mac with different sizes for DSP testing

openfpga_flow/benchmarks/micro_benchmark/mac_2/mac_2.v

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+//-------------------------------------------------------
+//  Functionality: A 2-bit multiply-acculumate circuit
+//  Author:        Xifan Tang
+//-------------------------------------------------------
+
+module mac_2(a, b, c, out);
+parameter DATA_WIDTH = 2;  /* declare a parameter. default required */
+input [DATA_WIDTH - 1 : 0] a, b, c;
+output [DATA_WIDTH - 1 : 0] out;
+
+assign out = a * b + c;
+
+endmodule
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openfpga_flow/benchmarks/micro_benchmark/mac_4/mac_4.v

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+//-------------------------------------------------------
+//  Functionality: A 4-bit multiply-acculumate circuit
+//  Author:        Xifan Tang
+//-------------------------------------------------------
+
+module mac_4(a, b, c, out);
+parameter DATA_WIDTH = 4;  /* declare a parameter. default required */
+input [DATA_WIDTH - 1 : 0] a, b, c;
+output [DATA_WIDTH - 1 : 0] out;
+
+assign out = a * b + c;
+
+endmodule
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openfpga_flow/benchmarks/micro_benchmark/mac_6/mac_6.v

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+//-------------------------------------------------------
+//  Functionality: A 6-bit multiply-acculumate circuit
+//  Author:        Xifan Tang
+//-------------------------------------------------------
+
+module mac_6(a, b, c, out);
+parameter DATA_WIDTH = 6;  /* declare a parameter. default required */
+input [DATA_WIDTH - 1 : 0] a, b, c;
+output [DATA_WIDTH - 1 : 0] out;
+
+assign out = a * b + c;
+
+endmodule
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