Blackfin: clean up bf537-lq035 board resources

Now that the driver has been updated, convert the board resources to the
new i2c framework for managing slaves.

For boards that don't actually hook up to this hardware, simply drop the
resources altogether.

Signed-off-by: Michael Hennerich <michael.hennerich@analog.com>
Signed-off-by: Mike Frysinger <vapier@gentoo.org>