configs : Update BeBoPr setup script
Properly handle cape present but not loaded case, caused by disabling
the cape-bebopr-brdg overlay via the capemgr.disable_partno kernel
command line parameter (as was used by default on earlier Machinekit
images).

Signed-off-by: Charles Steinkuehler <charles@steinkuehler.net>
Merge pull request #191 from cdsteinkuehler/config-bebopr

configs : Update BeBoPr setup script