src/platforms/common: move to platforms/common

Script to update include paths:
for i in $(grep -rl 'include <px4_work_queue' src platforms); do sed -i 's/#include <px4_work_queue/#include <px4_platform_common\/px4_work_queue/' $i; done

platforms/common/work_queue/queue.c

@@ -0,0 +1,98 @@
+/************************************************************************
+ *
+ *   Copyright (C) 2007-2009 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <gnutt@nuttx.org>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name NuttX nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ * Modified for use in Linux by Mark Charlebois
+ *
+ ************************************************************************/
+
+// FIXME - need px4_queue
+#include <queue.h>
+#include <stddef.h>
+
+__EXPORT void sq_rem(sq_entry_t *node, sq_queue_t *queue);
+sq_entry_t *sq_remafter(sq_entry_t *node, sq_queue_t *queue);
+void sq_rem(sq_entry_t *node, sq_queue_t *queue)
+{
+	if (queue->head && node) {
+		if (node == queue->head) {
+			queue->head = node->flink;
+
+			if (node == queue->tail) {
+				queue->tail = NULL;
+			}
+
+		} else {
+			sq_entry_t *prev;
+
+			for (prev = (sq_entry_t *)queue->head;
+			     prev && prev->flink != node;
+			     prev = prev->flink);
+
+			if (prev) {
+				sq_remafter(prev, queue);
+			}
+		}
+	}
+}
+
+sq_entry_t *sq_remafter(sq_entry_t *node, sq_queue_t *queue)
+{
+	sq_entry_t *ret = node->flink;
+
+	if (queue->head && ret) {
+		if (queue->tail == ret) {
+			queue->tail = node;
+			node->flink = NULL;
+
+		} else {
+			node->flink = ret->flink;
+		}
+
+		ret->flink = NULL;
+	}
+
+	return ret;
+}
+
+__EXPORT void sq_addfirst(sq_entry_t *node, sq_queue_t *queue);
+void sq_addfirst(sq_entry_t *node, sq_queue_t *queue)
+{
+	node->flink = queue->head;
+
+	if (!queue->head) {
+		queue->tail = node;
+	}
+
+	queue->head = node;
+}
+
+