bsp2arch.pl: initial commit (processor, memory)

The utility bsp2arch.pl reads the XML hardware description file
from the Epiphany SDK and generates a DOL architecture specification.

example:
$ ./bsp2arch.pl zed_E16G3_512mb.xml epiphany.xml

The SDK uses a flat hardware description file (HDF), which was supposed
to be a temporary solution (SDK 4.x documentation), but seems to be
final (SDK 5.x documentation).

The current version does not define any <hw_channel>, <writepath> or
<readpath> tags and does not need any flattening.