drivers: remove unnecessary use of DEVICE_AND_API_INIT

For drivers that support CONFIG_DEVICE_POWER_MANAGEMENT there are some
cases that look like:

  #ifdef CONFIG_DEVICE_POWER_MANAGEMENT
    DEVICE_DEFINE()
  #else
    DEVICE_AND_API_INIT()
  #endif

There is no need to special case this as the pm_control_fn argument to
DEVICE_DEFINE will just be ignored in the
!CONFIG_DEVICE_POWER_MANAGEMENT case.  So we can cleanup the code a
little and remove the #else cases for the drivers that do this.

Signed-off-by: Kumar Gala <kumar.gala@linaro.org>