The following changes where added.
- Removes dependency to slave structure. Selecting a device on the bus only
requires the unique romcode.
- Make search operation mutual exclusive on the bus. This is necessary to
prevent another driver instance from making a transition on the bus at
the same time.
- Skip also rom when only 1 slave is expected on the bus. Physical
connected devuce should be indicated by the maxslave paramter during
initializing, not the reigstered slaves.
- Fixes some compiler warnings in existing ds28e17 driver.
Signed-off-by: Marco Krahl <ocram.lhark@gmail.com>