audiopolicy: remove double call to attach / getModuleForDeviceType

For a2dp hybrid mode, device retrieval is done through type / code pair.
When the device is connected, getDeviceDescriptor is called with allowToCreate
boolean. As a result, HwModuleCollection::createDevice will be called, invoking
getModuleForDeviceTypes as done laterly in setDeviceConnectionState.

This CL removes double call to these function.

Bug: 130284799
Test: make

Change-Id: I188f11e9325cfc6af2ae872e00485e00ccd9096b
Signed-off-by: Francois Gaffie <francois.gaffie@renault.com>