src/x86/up2.c: Add UP^2 EVT3 support

This commit adds a MRAA platform for the UP Squared board, EVT3 revision.
It handles the relevant FPGA configuration updates when using MRAA to
change pin modes or toggle GPIO directions.

Signed-off-by: Javier Arteaga <javier@emutex.com>
Signed-off-by: Nicola Lunghi <nicola.lunghi@emutex.com>
Signed-off-by: Brendan Le Foll <brendan.le.foll@intel.com>

include/x86/up2.h

@@ -0,0 +1,44 @@
+/*
+ * Author: Javier Arteaga <javier@emutex.com>
+ * Based on work from: Dan O'Donovan <dan@emutex.com>
+ *                     Nicola Lunghi <nicola.lunghi@emutex.com>
+ * Copyright (c) 2017 Emutex Ltd.
+ * Copyright (c) 2014 Intel Corporation.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining
+ * a copy of this software and associated documentation files (the
+ * "Software"), to deal in the Software without restriction, including
+ * without limitation the rights to use, copy, modify, merge, publish,
+ * distribute, sublicense, and/or sell copies of the Software, and to
+ * permit persons to whom the Software is furnished to do so, subject to
+ * the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
+ * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+ * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+ * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+
+#pragma once
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#include "mraa_internal.h"
+
+// +1 as pins are "1 indexed"
+#define MRAA_UP2_PINCOUNT    (40 + 1)
+
+mraa_board_t*
+mraa_up2_board();
+
+#ifdef __cplusplus
+}
+#endif