- due to the fact that device mutex was obtained to prevent threaded access to
image there was a problem when other thread was also doing readImage call
That thread got read Image kernel mutex first and then it was acquiring device
mutex, which was taken by other thread doing mapImage call.
- In current code device mutex is not taken to service mapImage call, instead
image is being guarded by its own mutex.
Change-Id: Ic4c5a019708d7ec5b240bc5b08c5a65173827392
