If being used camera has been disconnected, state and status will
remain like it is still active. Also no events are sent.
Previously to fix this the camera needed to be unloaded and loaded again manually.

IMediaEvent provides an ability to catch device removal notification
with EC_DEVICE_LOST event.

Since ISampleGrabber is used to get buffers.
Added a fix to check if no buffers received for some time
afterwards check for EC_DEVICE_LOST event.
In case if the device is lost, the camera should be unloaded.

Change-Id: I3a5edf00ce8ee25d8b06800fdad833a722bdba0d
Task-number: QTBUG-68035
Reviewed-by: VaL Doroshchuk <valentyn.doroshchuk@qt.io>
Reviewed-by: Maurice Kalinowski <maurice.kalinowski@qt.io>