[Cin] selectable vaapi decoder device

[Andrew Randrianasulu]

Because I have this  dual-gpu laptop with intel and radeon (r600)
decoding devices I tried to get second (mesa/r600) device going but
init failed .. I looked into decoding example:


https://gist.github.com/kajott/d1b29c613be30893c855621edd1f212e

and created attached patch

now you can select your specific device with env variable:

CIN_DRM_DEC=/dev/dri/renderD129 DRI_PRIME=1 LIBVA_DRIVER_NAME=r600  bin/cin

in theory same treatment can be applied (with different variable name)
 to second instance of av_hwdevice_ctx_create (in hw encoder init) but
I have no device to test it ...
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