vaapi: add device env to plugin dependencies
In a multi-gpu system, each device may support different features.
Add GST_VAAPI_DRM_DEVICE to plugin dependencies to ensure registered features are re-evaluated according to user specified device.
In a multi-gpu system, each device may support different features.
Add GST_VAAPI_DRM_DEVICE to plugin dependencies to ensure registered features are re-evaluated according to user specified device.