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nvdec: Register elements per device/codec with capability check

Seungha Yang requested to merge seungha.yang/gst-plugins-bad:nvdec-check-caps into master 
nvdec: Create CUDA context with registered device id

Only the default device has been used by NVDEC so far.
This commit make it possible to use registered device id.
To simplify device id selection, GstNvDecCudaContext usage is removed.
nvdec: Register elements per device/codec with capability check

By this commit, each codec has its own element factory so the
nvdec element factory is removed. Also, if there are more than one device,
additional nvdec element factory will be created per
device like nvh264device{device-id}dec, so that the element factory
can expose the exact capability of the device for the codec.

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