For use by Camera HAL libraries to perform one-time initialization
steps after the library is loaded.
Bug: 20016050
Change-Id: Ia01ae0eafcadece9124ac2cfcc3b1c3939352843
* Basic skeleton of usb camera hal implementation
* Vendor tag is not supported yet
* Further usb camera hal implementation can be filled into UsbCamera.cpp
* Hot plug thread need to be implemented
Change-Id: Ida63b6d640e32192f5b60a280d9d5106d80e523f