va: Delete the display lock/unlock when we call VA-API.
According to the VA-API's description, they are MT-safe, we do not need to care about that in our middleware layer. The lock/unlock operations have overhead and make the performance lower.
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According to the VA-API's description, they are MT-safe, we do not need to care about that in our middleware layer. The lock/unlock operations have overhead and make the performance lower.