scripts: Add device tree parser script

As decided during the Zephyr Mini Summit in December 2016, we're going
to use the same Device Tree format as used by the Linux kernel to store
device configuration from vendors.

This is a parser written during the summit that will parse *.dts files,
and will be used as part of the solution to read in the files provided
by manufacturers and generate board configuration files.

The script will also optionally generate files in the DOT language so
that DTS files can be graphed using the Graphviz suite.

Change-Id: I6e2b7a64a6dcc349b2888332a660b4700af6cd63
Signed-off-by: Leandro Pereira <leandro.pereira@intel.com>

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