[feat]: OpenRISC gcc port and boards support

examples/or1k/README.md

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+# Configuration
+
+## Building
+
+```sh
+scons --config-dir=examples/or1k/ user_libs=-lm cc=or1k-elf-gcc cflags="-c -Wall -O2 -ffunction-sections -mhard-mul -mhard-div -mhard-float -mdouble-float -mror" ldflags="-Wl,-gc-sections"
+```

examples/or1k/boardsupport.c

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+/* Copyright (C) 2017 Embecosm Limited and University of Bristol
+
+   Contributor Madhu Sudhanan <madhu2000u@gmail.com>
+
+   This file is part of Embench and was formerly part of the Bristol/Embecosm
+   Embedded Benchmark Suite.
+
+   SPDX-License-Identifier: GPL-3.0-or-later */
+
+#include <support.h>
+
+void
+initialise_board ()
+{
+
+}
+
+void __attribute__ ((noinline)) __attribute__ ((externally_visible))
+start_trigger ()
+{
+
+}
+
+void __attribute__ ((noinline)) __attribute__ ((externally_visible))
+stop_trigger ()
+{
+
+}

examples/or1k/boardsupport.h

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+/* Copyright (C) 2017 Embecosm Limited and University of Bristol
+
+   Contributor Madhu Sudhanan <madhu2000u@gmail.com>
+
+   This file is part of Embench and was formerly part of the Bristol/Embecosm
+   Embedded Benchmark Suite.
+
+   SPDX-License-Identifier: GPL-3.0-or-later */
+
+#define CPU_MHZ 1