i2c: designware: use enable on resume instead initialization

According to documentation and tests, initialization is not
necessary on module resume, since the controller keeps its state
between disable/enable. Change the target address is also allowed.

So, this patch replaces the initialization on module resume with a
simple enable, and removes the (non required anymore) enables and
disables.

Signed-off-by: Fabio Mello <fabio.mello@intel.com>
Signed-off-by: Lucas De Marchi <lucas.demarchi@intel.com>
2 files changed