Benchmarks: Micro benchmark - add initialization options for rocm gemm flops (#578)

**Description**
add initialization options for rocm gemm flops.

superbench/benchmarks/micro_benchmarks/rocm_gemm_flops_performance.py

@@ -91,6 +91,14 @@ def add_parser_arguments(self):
             required=False,
             help='Specifies the scalar beta.',
         )
+        self._parser.add_argument(
+            '--initialization',
+            type=str,
+            default='hpl',
+            choices=['rand_int', 'trig_float', 'hpl'],
+            required=False,
+            help='Initialize with random integers, trig functions sin and cos, or hpl-like input.',
+        )
 
     def _preprocess(self):
         """Preprocess/preparation operations before the benchmarking.
@@ -110,6 +118,7 @@ def _preprocess(self):
             command += ' --lda {} --ldb {} --ldc {} --ldd {}'.format(
                 self._args.lda, self._args.ldb, self._args.ldc, self._args.ldd
             )
+            command += ' --initialization {}'.format(self._args.initialization)
             self._commands.append(command)
 
         return True

tests/benchmarks/micro_benchmarks/test_rocm_gemm_flops_performance.py

@@ -43,7 +43,7 @@ def test_rocm_flops_performance(self):
         assert (benchmark._args.k == 8192)
 
         params = '--transposeA N --transposeB T -m 7680 -n 8192 -k 8192' + \
-            ' --alpha 1 --beta 0 --lda 8384 --ldb 8384 --ldc 8384 --ldd 8384'
+            ' --alpha 1 --beta 0 --lda 8384 --ldb 8384 --ldc 8384 --ldd 8384 --initialization hpl'
         # Check command list
         expected_command = [
             'rocblas-bench -r f64_r -f gemm ' + params,