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plugins: encode: fix a deadlock because of _drain()

He Junyan requested to merge He_Junyan/gstreamer-vaapi:fix_dead_lock_encode into master

We call gst_vaapiencode_drain() in gst_vaapiencode_change_state(), whose context does not hold the stream lock of the encoder. The current gst_vaapiencode_drain inside unlock/lock pair adds a extra lock count to the stream lock of encoder and causes hang later.

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