3/5 - lpd7a40x rev detect & buffer direction

CHANGELOG
* Patch by Paul Ruhland, 14 November 2004
- following changes to 'board_init()' in 'board/lpd7a40x/lpd7a40x.c':
- cpld revision check
- for cpld revisions > 0x34 set gpio pins to set I/O buffers
to proper direction
- changes to 'doc/README.lpd7a40x' to reflect the card engine version detection and I/O buffer redirection for newer card engines
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