There is only one 74hc595 connected to GPIO but two were given
in the registers-number property. Fix it up.
Signed-off-by: NSebastian Hesselbarth <sebastian.hesselbarth@gmail.com>
Tested-By: NBenoit Masson <yahoo@perenite.com>
Signed-off-by: NJason Cooper <jason@lakedaemon.net>