arm/fdt: Initial reorg of fdt support code

* Makes FDT support code useable by everyone
  without all of the externs
* Further movement to be non-u-boot centic
  may still happen.

headers/private/kernel/platform/u-boot/fdt_support.h

@@ -0,0 +1,21 @@
+/*
+ * Copyright 2012-2015, Haiku, Inc.
+ * Distributed under the terms of the MIT License.
+ *
+ * Authors
+ *		Alexander von Gluck IV, [email protected]
+ */
+#ifndef __FDT_SUPPORT_H
+#define __FDT_SUPPORT_H
+
+
+#include <KernelExport.h>
+
+
+void dump_fdt(const void *fdt);
+status_t fdt_get_cell_count(int32 pathOffset,
+	int32 &addressCells, int32 &sizeCells);
+
+
+
+#endif /*__FDT_SUPPORT_H*/